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Stockholders' Equity - Summary of Stock Option Activity (Detail)
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding Beginning Balance, Number of Shares | shares 1,317,402
Granted, Number of Shares | shares 79,500
Canceled/Forfeited, Number of Shares | shares (35,335)
Outstanding Ending Balance, Number of Shares | shares 1,361,567
Outstanding Beginning Balance, Weighted-Average Exercise Price Per Share $ 9.09
Granted, Weighted-Average Exercise Price Per Share 2.50
Canceled/Forfeited, Weighted-Average Exercise Price Per Share 12.37
Outstanding Ending Balance, Weighted-Average Exercise Price Per Share 8.62
Outstanding, 2.08 — 26.00 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 2.08
Exercise Price Per Share, Maximum 26.00
Granted, 2.13 — 2.71 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 2.13
Exercise Price Per Share, Maximum 2.71
Canceled/Forfeited, 6.40 — 23.20 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 6.40
Exercise Price Per Share, Maximum 23.20
Outstanding, 2.08 — 26.00 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 2.08
Exercise Price Per Share, Maximum $ 26.00