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Fair Value of Warrants Outstanding (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Class of Warrant or Right [Line Items]    
Warrant liability $ 3,978 $ 10,485 [1]
2010 Warrants    
Class of Warrant or Right [Line Items]    
Warrant liability $ 3,978 $ 10,485
[1] The financial information in this column was derived from audited consolidated financial statements included in the Company's 2014 Annual Report on Form 10-K.