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Change in Fair Value of Derivative Liabilities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivatives, Fair Value [Line Items]        
Beginning Balance     $ 8,170 $ 7,519
Record derivative liability       868
(Gain) loss on change in fair value of derivative liabilities $ (3,610) $ 230 (8,170) 366
Transfer derivative liability to equity       (1,814)
Ending Balance   6,930   6,930
Warrant        
Derivatives, Fair Value [Line Items]        
Compensation income for change in fair value of warrants issued to former employees       (9)
Warrants Issued October 2009        
Derivatives, Fair Value [Line Items]        
Beginning Balance       119
(Gain) loss on change in fair value of derivative liabilities       (110)
Warrants Issued October 2009 | Warrant        
Derivatives, Fair Value [Line Items]        
Compensation income for change in fair value of warrants issued to former employees       (9)
Embedded Derivative Financial Instruments        
Derivatives, Fair Value [Line Items]        
Beginning Balance     8,170 7,400
(Gain) loss on change in fair value of derivative liabilities     $ (8,170) (470)
Ending Balance   $ 6,930   6,930
Preferred Stock Purchase Option        
Derivatives, Fair Value [Line Items]        
Record derivative liability       868
(Gain) loss on change in fair value of derivative liabilities       946
Transfer derivative liability to equity       $ (1,814)