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Change in Fair Value of Derivative Liabilities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivatives, Fair Value [Line Items]          
Beginning Balance       $ 7,519 $ 17,994
Record derivative liability       868  
Record initial fair value of derivative liability on senior notes     $ 3,500   3,500
(Gain) loss on change in fair value of derivative liabilities   $ 600 (3,011) 136 (7,404)
Transfer derivative liability to equity       (1,814)  
Ending Balance $ 6,700 6,700 13,913 6,700 13,913
Warrant          
Derivatives, Fair Value [Line Items]          
Compensation income for change in fair value of warrants issued to former employees       (9) (177)
Warrants Issued October 2009          
Derivatives, Fair Value [Line Items]          
Beginning Balance       119 6,894
(Gain) loss on change in fair value of derivative liabilities       (110) (2,204)
Ending Balance     4,513   4,513
Warrants Issued October 2009 | Warrant          
Derivatives, Fair Value [Line Items]          
Compensation income for change in fair value of warrants issued to former employees       (9) (177)
Embedded Derivative Financial Instruments          
Derivatives, Fair Value [Line Items]          
Beginning Balance       7,400 11,100
Record initial fair value of derivative liability on senior notes     3,500   3,500
(Gain) loss on change in fair value of derivative liabilities 800     (700) (5,200)
Ending Balance $ 6,700 $ 6,700 $ 9,400 6,700 $ 9,400
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)