Stockholders' Equity - Summary of Stock Option Activity (Detail) - Stock Option $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Number of Shares, Beginning balance (in shares) | shares	861,366
Granted, Number of Shares (in shares) | shares	0
Canceled, Number of Shares (in shares) | shares	(8,000)
Outstanding, Number of Shares, Ending balance (in shares) | shares	853,366
Exercisable, Number of Shares (in shares) | shares	474,366
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, Weighted-Average Exercise Price, Beginning balance (in dollars per share) | $ / shares	$ 3.99
Granted, Weighted-Average Exercise Price (in dollars per share) | $ / shares	0.00
Canceled, Weighted-Average Exercise Price (in dollars per share) | $ / shares	9.90
Outstanding, Weighted-Average Exercise Price, Ending balance (in dollars per share) | $ / shares	3.94
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 5.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures
Outstanding, Aggregate Intrinsic Value | $	$ 815
Exercisable, Aggregate Intrinsic Value | $	$ 163
Outstanding, Weighted-Average Remaining Contractual Term (in years)	5 years 3 months 26 days
Exercisable, Weighted-Average Remaining Contractual Life (in years)	2 years 2 months 16 days