Stockholders' Equity - Summary of Option Activity (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Shares, Outstanding at beginning of period | shares	3,196,100
Number of Shares, Granted | shares	480,818
Number of Shares, Exercised | shares	(160,050)
Number of Shares, Forfeitures | shares	(194,490)
Number of Shares, Outstanding at end of period | shares	3,322,378
Weighted Average Exercise Price Per Share, Outstanding at beginning of period	$ 4.32
Weighted Average Exercise Price Per Share, Granted	9.28
Weighted average Exercise Price Per Share, Exercised	3.46
Weighted Average Exercise Price Per Share, Forfeitures	12.94
Weighted Average Exercise Price Per Share, Outstanding at end of period	$ 5.47
Aggregate Intrinsic Value, Outstanding at end of period | $	$ 4,628