Annual report pursuant to Section 13 and 15(d)

Redeemable Convertible Preferred Stock - Additional Information (Detail)

v2.4.1.9
Redeemable Convertible Preferred Stock - Additional Information (Detail) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 2 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Sep. 30, 2013
Aug. 31, 2008
Aug. 31, 2006
Dec. 31, 2013
Dec. 31, 2010
Dec. 31, 2014
Nov. 30, 2009
Dec. 31, 2004
Dec. 31, 2003
Sep. 30, 2013
Dec. 31, 2012
Apr. 30, 2007
Dec. 31, 2010
Jun. 30, 2010
Jul. 25, 2014
Temporary Equity [Line Items]                              
Issuance of common stock upon conversion of redeemable convertible preferred stock 2,793,281us-gaap_ConversionOfStockSharesIssued1                            
Conversion of preferred stock to common stock $ 320,000,000us-gaap_ConversionOfStockAmountIssued1     $ 323,155,000us-gaap_ConversionOfStockAmountIssued1                      
Convertible preferred stock issued     27,345us-gaap_TemporaryEquitySharesIssued 0us-gaap_TemporaryEquitySharesIssued   0us-gaap_TemporaryEquitySharesIssued                  
Convertible preferred stock outstanding       0us-gaap_TemporaryEquitySharesOutstanding   0us-gaap_TemporaryEquitySharesOutstanding                  
Purchase price per share of preferred stock     $ 365.70us-gaap_SharesIssuedPricePerShare                       $ 5.50us-gaap_SharesIssuedPricePerShare
Proceed from issuance of redeemable preferred stock     10,000,000us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock                        
Percentage of reduction in number of shares exercisable         50.00%cyma_WarrantsExercisableDecreasedPercentage                    
Number of warrants outstanding         14,623us-gaap_ClassOfWarrantOrRightOutstanding               14,623us-gaap_ClassOfWarrantOrRightOutstanding    
Repurchase of Stock, value   82,000us-gaap_StockRepurchasedDuringPeriodValue   (8,247,000)us-gaap_StockRepurchasedDuringPeriodValue                      
Dividends declared 0us-gaap_DividendsPayableCurrentAndNoncurrent                 0us-gaap_DividendsPayableCurrentAndNoncurrent          
Next sale and issuance of capital stock of the Company [Member]                              
Temporary Equity [Line Items]                              
Participation right, description           Any holder that participated in the 2013 financing for between 100% and 300% of such holder's Pro Rata Share (the "Participation Multiple") had each share of preferred stock convert into shares of common stock by multiplying the product of (y) the aggregate number of shares of preferred stock held by such holder multiplied by the applicable Participation Multiple and (z) four (4).                  
Scenario two [Member] | Minimum [Member]                              
Temporary Equity [Line Items]                              
Per share price           8.00cyma_RedeemableConvertiblePreferredStockConversionPricePerShare
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioTwoMember
                 
Aggregate gross proceed           30,000,000us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioTwoMember
                 
Scenario two [Member] | Next sale and issuance of capital stock of the Company [Member]                              
Temporary Equity [Line Items]                              
Conversion ratio           0.25cyma_PreferredStockConversionRatio
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= cyma_AdditionalOfferingMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioTwoMember
                 
Scenario two [Member] | Next sale and issuance of capital stock of the Company [Member] | Minimum [Member]                              
Temporary Equity [Line Items]                              
Participation percentage in financing           1.00%cyma_ParticipationPercentage
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= cyma_AdditionalOfferingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioTwoMember
                 
Scenario two [Member] | Next sale and issuance of capital stock of the Company [Member] | Maximum [Member]                              
Temporary Equity [Line Items]                              
Participation percentage in financing           99.00%cyma_ParticipationPercentage
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= cyma_AdditionalOfferingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioTwoMember
                 
Series B-1 Preferred [Member]                              
Temporary Equity [Line Items]                              
Convertible preferred stock issued               188,894us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
136,520us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
           
Purchase price per share of preferred stock           232.93us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
  $ 232.93us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
$ 232.93us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
           
Preferred stock balances, price per share           18.64us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
                 
Proceed from issuance of redeemable preferred stock               44,000,000us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
31,800,000us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
           
Issued warrants to purchase common stock             29,245us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
29,245us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
             
Warrant issued, exercise price per share               $ 30.21us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
             
Common stock, price per share               $ 1.51us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
             
warrant issued, exercise period               5 years              
Warrant, extended expiration date             Dec. 31, 2011       Apr. 01, 2013        
Percentage of reduction in number of shares exercisable                     45.00%cyma_WarrantsExercisableDecreasedPercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Number of warrants outstanding                     13,160us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Repurchase of Stock, shares   1,610us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
                         
Aggregate cumulative dividend                   63,100,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
59,600,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Aggregate cumulative dividend, per share                   $ 168.96us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
$ 159.72us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Preferred stock liquidation preference           232.93us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
                 
Series A-1 Preferred [Member]                              
Temporary Equity [Line Items]                              
Purchase price per share of preferred stock           232.93us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
                 
Preferred stock balances, price per share           18.64us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
                 
Repurchase of Stock, shares   646us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
                         
Aggregate cumulative dividend                   2,300,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
2,200,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Aggregate cumulative dividend, per share                   $ 183.64us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 174.40us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Preferred stock liquidation preference           232.93us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
                 
Series C-1 Preferred [Member]                              
Temporary Equity [Line Items]                              
Purchase price per share of preferred stock           365.70us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
                 
Preferred stock balances, price per share           29.26us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
                 
Aggregate cumulative dividend                   5,600,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
5,100,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
       
Aggregate cumulative dividend, per share                   $ 201.83us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
$ 187.32us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
       
Preferred stock liquidation preference           365.70us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
                 
Series D-1 Preferred [Member]                              
Temporary Equity [Line Items]                              
Convertible preferred stock issued                       137,592us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Purchase price per share of preferred stock           232.94us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
          $ 232.94us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Preferred stock balances, price per share           18.64us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
                 
Proceed from issuance of redeemable preferred stock                       32,000,000us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Issued warrants to purchase common stock                       20,639us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Warrant issued, exercise price per share                       $ 22.13us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Common stock, price per share                       $ 0.79us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
warrant issued, exercise period                       5 years      
Warrant, extended expiration date         Apr. 13, 2013                    
Repurchase of Stock, shares   472us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
                         
Aggregate cumulative dividend                   15,900,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
14,600,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Aggregate cumulative dividend, per share                   $ 116.00us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
$ 106.75us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Preferred stock liquidation preference           232.93us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
                 
Series E-1 Preferred [Member]                              
Temporary Equity [Line Items]                              
Purchase price per share of preferred stock           232.93us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
                 
Preferred stock balances, price per share           18.64us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
                 
Shares issued upon conversion of debt             1,288us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
          37,119us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
859us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
 
Aggregate cumulative dividend                   1,900,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
1,500,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
       
Aggregate cumulative dividend, per share                   $ 48.14us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
$ 38.90us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
       
Preferred stock liquidation preference           465.87us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
                 
Warrants [Member]                              
Temporary Equity [Line Items]                              
Repurchase of Stock, shares   71us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember
                         
Series E-3 Convertible Preferred Stock [Member]                              
Temporary Equity [Line Items]                              
Shares issued upon conversion of debt         71,543us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesEThreeConvertiblePreferredStockMember
                   
Aggregate cumulative dividend                   $ 3,400,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesEThreeConvertiblePreferredStockMember
$ 2,700,000us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesEThreeConvertiblePreferredStockMember
       
Aggregate cumulative dividend, per share                   $ 47.28us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesEThreeConvertiblePreferredStockMember
$ 38.04us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesEThreeConvertiblePreferredStockMember
       
Preferred stock liquidation preference           290.97us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesEThreeConvertiblePreferredStockMember
                 
Series B-1 Preferred Stock [Member] | Scenario one, conversion basis [Member]                              
Temporary Equity [Line Items]                              
Conversion basis, Percentage of outstanding common stock           66.67%cyma_PreferredStockConversionBasisVotingPercentage
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesBOnePreferredStockMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioOneMember
                 
Series D-1 and E Preferred Stock [Member] | Scenario one, conversion basis [Member]                              
Temporary Equity [Line Items]                              
Conversion basis, Percentage of outstanding common stock           51.00%cyma_PreferredStockConversionBasisVotingPercentage
/ us-gaap_StatementClassOfStockAxis
= cyma_SeriesDAndEPreferredStockMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioOneMember