Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v2.4.1.9
Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax [Line Items]    
Provision for income taxes $ 0cyma_ProvisionForStateAndLocalIncomeTaxes $ 0cyma_ProvisionForStateAndLocalIncomeTaxes
Net valuation allowance change 11,200,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (1,800,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Cumulative change in ownership 50.00%cyma_CumulativeChangeInOwnershipPercentage  
Cumulative change in ownership period 3 years  
Significant change to its unrecognized tax benefits over the next twelve months 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit  
Income tax examination years The tax years 1998 through 2014 remain open to examination by the major taxing authorities.  
Domestic Tax Authority [Member]    
Income Tax [Line Items]    
Net operating loss carryforward 181,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
 
Research and development tax credit carry forwards 6,700,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
 
Domestic Tax Authority [Member] | Minimum [Member]    
Income Tax [Line Items]    
NOL carry forward expiry date 2024  
Domestic Tax Authority [Member] | Maximum [Member]    
Income Tax [Line Items]    
NOL carry forward expiry date 2034  
State and Local Jurisdiction [Member]    
Income Tax [Line Items]    
Net operating loss carryforward 164,600,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
Research and development tax credit carry forwards $ 3,200,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
State and Local Jurisdiction [Member] | Minimum [Member]    
Income Tax [Line Items]    
NOL carry forward expiry date 2015  
State and Local Jurisdiction [Member] | Maximum [Member]    
Income Tax [Line Items]    
NOL carry forward expiry date 2034