Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.1.9
Subsequent Events - Additional Information (Detail) (USD $)
12 Months Ended 2 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Feb. 28, 2015
Nov. 07, 2014
Subsequent Event [Line Items]        
Registration statement, sale of common stock       $ 25,000,000cyma_RegistrationPaymentArrangementCommonStockValue
Net proceeds from sale of common stock 25,430,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity 26,514,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity    
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Registration statement, sale of common stock     25,000,000cyma_RegistrationPaymentArrangementCommonStockValue
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Net proceeds from sale of common stock     $ 4,300,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember