Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Deficit) - Schedule of Stock Option Activity (Detail)

v3.7.0.1
Stockholders' Equity (Deficit) - Schedule of Stock Option Activity (Detail) - 2014 Stock Option/Stock Issuance Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options, Outstanding, Beginning Balance 680,434  
Options Granted 0  
Options Exercised 0  
Options Forfeited / Cancelled (24,318)  
Options, Outstanding, Ending Balance 656,116 680,434
Options, Exercisable at March 31, 2017 313,830  
Weighted-Average Exercise Price, Outstanding, Beginning Balance $ 2.27  
Weighted-Average Exercise Price, Options Granted 0  
Weighted-Average Exercise Price, Options Exercised 0  
Weighted-Average Exercise Price, Options Forfeited / Cancelled 4.17  
Weighted-Average Exercise Price, Outstanding, Ending Balance $ 2.23 $ 2.27
Weighted-Average Remaining Contractual Term, Outstanding 8 years 4 months 24 days 8 years 5 months 27 days
Weighted-Average Aggregate Intrinsic Value $ 6,555 $ 3,031