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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
Dec. 31, 2014
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Change in fair value of warrant liability     $ 0 $ 0 $ 3,280
Reclassification to additional paid-in-capital $ (8,219)       $ (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 $ 0    
Change in fair value of warrant liability   3,280      
Balance at December 31, 2014   $ 8,219   $ 0