Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
RSUs outstanding at December 31, 2014	899,402
RSUs awarded	446,000
RSUs released	(387,588)
RSUs forfeited	(126,997)
RSUs outstanding at December 31, 2015	830,817
RSUs vested and expected to vest at December 31, 2015	718,502
RSUs outstanding at December, 31, 2015, Weighted Average Remaining Contractual Term	1 year 7 months 17 days
RSUs vested and expected to vest at December 31, 2015, Weighted Average Remaining Contractual Term	1 year 7 months 10 days
RSUs outstanding at December 31, 2015, Aggregate Intrinsic Value | $	$ 7,585
RSUs vested and expected to vest at December 31, 2015, Aggregate Intrinsic Value | $	$ 6,560