Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

v2.4.1.9
Debt - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2013
Mar. 31, 2008
Sep. 30, 2008
Feb. 28, 2009
Jul. 31, 2013
Mar. 31, 2013
Jan. 31, 2012
Jul. 31, 2009
Dec. 31, 2014
Jun. 20, 2006
Dec. 31, 2010
Debt Instrument [Line Items]                        
Maximum borrowing capacity $ 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity                   $ 30,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Interest expense   600,000us-gaap_InterestExpenseDebt                    
Loan facility, outstanding principal and accrued interest settled 16,900,000cyma_StockIssuedDuringPeriodAmountForCancellationOfDebt                      
Loan facility extinguished in exchange of common stock 624,944us-gaap_DebtConversionConvertedInstrumentSharesIssued1                      
Facility loan, drawn 5,000,000us-gaap_ProceedsFromLongTermLinesOfCredit 4,853,000us-gaap_ProceedsFromLongTermLinesOfCredit                    
Facility fee 1.00%us-gaap_LineOfCreditFacilityCommitmentFeePercentage                      
Series E-1 Preferred [Member]                        
Debt Instrument [Line Items]                        
Conversion price                       $ 232.93us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Series C-1 Preferred [Member]                        
Debt Instrument [Line Items]                        
Conversion price         $ 438.84us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
      $ 438.84us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
     
Series C-1 Preferred [Member] | As Amended [Member]                        
Debt Instrument [Line Items]                        
Conversion price               292.56us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= cyma_AsAmendedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
       
First Issuance [Member]                        
Debt Instrument [Line Items]                        
Notes issued     3,500,000us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= cyma_FirstIssuanceMember
                 
Maturity date of debt     Mar. 17, 2011                  
Facility loan, fixed interest rate     7.57%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cyma_FirstIssuanceMember
                 
Second Issuance [Member]                        
Debt Instrument [Line Items]                        
Notes issued       10,500,000us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= cyma_SecondIssuanceMember
               
Maturity date of debt       Sep. 17, 2011                
Facility loan, fixed interest rate       7.57%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cyma_SecondIssuanceMember
               
Third Issuance [Member]                        
Debt Instrument [Line Items]                        
Notes issued         7,000,000us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= cyma_ThirdIssuanceMember
             
Maturity date of debt         Feb. 28, 2012              
Facility loan, fixed interest rate         4.42%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cyma_ThirdIssuanceMember
             
Third Issuance [Member] | As Amended [Member]                        
Debt Instrument [Line Items]                        
Maturity date of debt           Dec. 31, 2013 Aug. 01, 2013 Mar. 01, 2013        
Facility loan, fixed interest rate               4.919%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cyma_ThirdIssuanceMember
/ us-gaap_LongtermDebtTypeAxis
= cyma_AsAmendedMember
       
Fourth Issuance [Member]                        
Debt Instrument [Line Items]                        
Notes issued                 6,700,000us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= cyma_FourthIssuanceMember
     
Maturity date of debt                 Jul. 31, 2012      
Facility loan, fixed interest rate                 4.96%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cyma_FourthIssuanceMember
     
Fourth Issuance [Member] | As Amended [Member]                        
Debt Instrument [Line Items]                        
Maturity date of debt           Dec. 31, 2013 Aug. 01, 2013 Mar. 01, 2013        
Facility loan, fixed interest rate               5.46%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cyma_FourthIssuanceMember
/ us-gaap_LongtermDebtTypeAxis
= cyma_AsAmendedMember
       
Facility Loan Agreement [Member]                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
                     
Facility loan, interest amortization period                   36 months    
Percentage of principal amount as final payment                   6.50%cyma_PercentageOfPrincipalAmountAsFinalPayment
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
   
Facility loan, financial covenants                   Company must maintain compliance with one of two financial covenants at all times (1) maintain 1.3 times cash to outstanding debt or (2) maintain sufficient cash on hand to support eight months of operations based on a trailing average monthly cash burn.    
Aggregate outstanding term loans percentage                   100.00%cyma_PercentageOfAggregatePrincipalAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
   
Prepayment fee percentage                   3.00%cyma_PrepaymentFeePercentageOnPrincipalAmountOfLoanPrepaid
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
   
Facility Loan Agreement [Member] | First Tranche [Member]                        
Debt Instrument [Line Items]                        
Facility loan, fixed interest rate 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cyma_FirstTrancheMember
                     
Facility loan, drawn 5,000,000us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cyma_FirstTrancheMember
                     
Facility Loan Agreement [Member] | Second Tranche [Member]                        
Debt Instrument [Line Items]                        
Facility loan, drawn 5,000,000us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cyma_SecondTrancheMember
                     
Facility Loan Agreement [Member] | Scenario one, conversion basis [Member] | Second Tranche [Member]                        
Debt Instrument [Line Items]                        
Facility loan, fixed interest rate 8.75%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cyma_SecondTrancheMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioOneMember
                     
Facility Loan Agreement [Member] | Scenario two [Member] | Second Tranche [Member] | Wall Street Journal Prime Rate [Member]                        
Debt Instrument [Line Items]                        
Facility loan, prime rate plus 4.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= cyma_WallStreetJournalPrimeRateMember
/ us-gaap_DebtInstrumentAxis
= cyma_FacilityLoanAgreementMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cyma_SecondTrancheMember
/ us-gaap_StatementScenarioAxis
= cyma_ScenarioTwoMember
                     
Warrants, Exercise price of $5.00 per share [Member]                        
Debt Instrument [Line Items]                        
Warrants issued 121,739us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_ClassOfWarrantOrRightAxis
= cyma_WarrantsTwoMember
                     
Exercise price $ 5.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= cyma_WarrantsTwoMember
$ 5.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= cyma_WarrantsTwoMember
                   
Long term warrant liability $ 500,000us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_ClassOfWarrantOrRightAxis
= cyma_WarrantsTwoMember