Annual report pursuant to Section 13 and 15(d)

Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)

v2.4.1.9
Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $)
In Thousands, except Share data
Total
Redeemable Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Balance at beginning of period at Dec. 31, 2012 $ (328,567)us-gaap_StockholdersEquity $ 318,697us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
  $ 913us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  $ (329,480)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= cyma_AccumulatedDeficitMember
Balance at beginning of period (in shares) at Dec. 31, 2012   661,059us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
5,792us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Issuance of common stock upon exercise of options (in shares)     78us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Non-employee stock-based compensation expense 17us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity     17us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Employee and director stock-based compensation expense 866us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue     866us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Accretion to redemption value of redeemable convertible preferred stock (9,289)us-gaap_PreferredStockAccretionOfRedemptionDiscount 9,289us-gaap_PreferredStockAccretionOfRedemptionDiscount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
      (9,289)us-gaap_PreferredStockAccretionOfRedemptionDiscount
/ us-gaap_StatementEquityComponentsAxis
= cyma_AccumulatedDeficitMember
Repurchase of convertible preferred stock, value 8,247us-gaap_StockRepurchasedDuringPeriodValue (8,250)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
  8,247us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Repurchase of convertible preferred stock, (in shares)   (39,606)us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
       
Conversion of preferred stock to common stock, value 319,736us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities (319,736)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
  319,736us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Conversion of preferred stock to common stock, (in shares)   (621,453)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
2,793,281us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Issuance of common stock, value 20,712us-gaap_StockIssuedDuringPeriodValueNewIssues   1us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
20,711us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Issuance of common stock, (in shares)     6,030,969us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Conversion of incentive award from liability to equity accounting 16,945us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt     16,945us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Extinguishment of debt through issuance of common stock, (in shares)     624,944cyma_ExtinguishmentOfDebtThroughIssuanceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net loss (10,073)us-gaap_NetIncomeLoss         (10,073)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= cyma_AccumulatedDeficitMember
Net unrealized gain on marketable securities 2us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax       2us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Balance at end of period at Dec. 31, 2013 18,596us-gaap_StockholdersEquity   1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
367,435us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(348,842)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= cyma_AccumulatedDeficitMember
Balance at end of period (in shares) at Dec. 31, 2013     9,455,064us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Issuance of common stock upon exercise of warrants, value 595cyma_StockIssuedDuringPeriodValueStockWarrantsExercised     595cyma_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Issuance of common stock upon exercise of warrants (Shares)     36,613cyma_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Issuance of common stock upon exercise of options, value 4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised     4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Issuance of common stock upon exercise of options (in shares) 431us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised   431us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Non-employee stock-based compensation expense 8us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity     8us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Employee and director stock-based compensation expense 1,173us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue     1,173us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Issuance of common stock, value 25,286us-gaap_StockIssuedDuringPeriodValueNewIssues     25,286us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Issuance of common stock, (in shares)     5,204,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Conversion of incentive award from liability to equity accounting 121us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt     121us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Net loss (31,917)us-gaap_NetIncomeLoss         (31,917)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= cyma_AccumulatedDeficitMember
Net unrealized gain on marketable securities (16)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax       (16)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Balance at end of period at Dec. 31, 2014 $ 13,850us-gaap_StockholdersEquity   $ 1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 394,622us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (14)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (380,759)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= cyma_AccumulatedDeficitMember
Balance at end of period (in shares) at Dec. 31, 2014     14,696,108us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember