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Securities Purchase Agreement - Summary of Change to Fair Value of Warrant (Detail) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2014
Nov. 17, 2014
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Change in fair value of warrant liability       $ 3,300
Reclassification to additional paid-in-capital $ (8,219)      
Level 3        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at September 8, 2014 (Transaction Date) $ 8,219 $ 4,939    
Change in fair value of warrant liability   3,280    
Balance at December 31, 2014   $ 8,219 $ 0