Annual report pursuant to Section 13 and 15(d)

Common Stock - Reserved Shares of Authorized but Unissued Common Stock (Detail)

v2.4.1.9
Common Stock - Reserved Shares of Authorized but Unissued Common Stock (Detail)
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]    
Total reserved shares of common stock 3,317,963us-gaap_CommonStockCapitalSharesReservedForFutureIssuance 2,320,021us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Warrants for common stock [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock 1,768,347us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_InvestmentTypeAxis
= cyma_CommonStockWarrantMember
1,742,727us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_InvestmentTypeAxis
= cyma_CommonStockWarrantMember
Equity incentive plans [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock 1,549,616us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_InvestmentTypeAxis
= cyma_EquityIncentivePlanMember
577,294us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_InvestmentTypeAxis
= cyma_EquityIncentivePlanMember