XML 36 R26.htm IDEA: XBRL DOCUMENT v3.8.0.1
Summary of Significant Accounting Policies - Schedule of Reconciliation of Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Change in fair value of warrant liability $ 269 $ (539) $ 673 $ (539)
Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     13,198  
Change in fair value of warrant liability     673  
Ending balance $ 13,871   $ 13,871