Annual report pursuant to Section 13 and 15(d)

Organization and Description of Business - Additional Information (Detail)

v2.4.1.9
Organization and Description of Business - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended
Jul. 25, 2014
Nov. 22, 2013
Oct. 31, 2013
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Jul. 25, 2014
Sep. 30, 2013
Aug. 31, 2006
Jun. 20, 2006
Organization, Consolidation and Presentation of Financial Statements [Abstract]                    
Net loss         $ (31,917,000)us-gaap_NetIncomeLoss $ (10,073,000)us-gaap_NetIncomeLoss        
Cash flows from operating activities         (21,114,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (8,458,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations        
Accumulated deficit         (380,759,000)us-gaap_RetainedEarningsAccumulatedDeficit (348,842,000)us-gaap_RetainedEarningsAccumulatedDeficit        
Gross proceeds from issuance of common stock and warrants in a private placement   2,700,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement   26,800,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement            
Additional proceeds from venture debt financing       5,000,000us-gaap_ProceedsFromLongTermLinesOfCredit   4,853,000us-gaap_ProceedsFromLongTermLinesOfCredit        
Venture debt financing loan agreement amount               10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity   30,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Net proceeds after deducting placement agent fees and estimated offering expenses       28,800,000cyma_ProceedsFromIssuanceOfPrivatePlacementNetOfFeesAndExpenses            
Net proceeds from issuance of private placement     2,200,000cyma_NetProceedsFromIssuanceOfPrivatePlacement 22,800,000cyma_NetProceedsFromIssuanceOfPrivatePlacement            
Issued shares of common stock in cancellation of debt       16,900,000cyma_StockIssuedDuringPeriodAmountForCancellationOfDebt            
Shares issued in public offering 4,600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues                  
Common stock offering price             $ 5.50us-gaap_SharesIssuedPricePerShare   $ 365.70us-gaap_SharesIssuedPricePerShare  
Net proceeds from public offering 23,000,000us-gaap_ProceedsFromIssuanceInitialPublicOffering                  
Cash and cash equivalents and marketable securities         $ 34,800,000us-gaap_CashCashEquivalentsAndShortTermInvestments