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Stockholders' Equity - Summary of Warrant Activity (Detail) - Warrants [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants outstanding at beginning of period, Number of Shares 84,986  
Warrants granted, Number of Shares 1,701,583  
Warrants exercised, Number of Shares 0  
Warrants forfeitures, Number of Shares 0  
Warrants outstanding at end of period, Number of Shares 1,786,569  
Warrants outstanding at beginning of period, Weighted Average Exercise Price Per Share $ 3.53  
Warrants granted, Weighted Average Exercise Price Per Share 2.38  
Warrants exercised, Weighted Average Exercise Price Per Share 0  
Warrants forfeitures, Weighted Average Exercise Price Per Share 0  
Warrants outstanding at end of period, Weighted Average Exercise Price Per Share $ 2.43  
Warrants outstanding, Aggregate Intrinsic Value $ 0 $ 0