Stock-Based Compensation - Summary of Stock Option Activity (Detail) shares in Thousands	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares Issuable Under Options, Beginning balance | shares	1,657
Shares Issuable Under Options, Granted | shares	533
Shares Issuable Under Options, Exercised | shares	0
Shares Issuable Under Options, Canceled | shares	(14)
Shares Issuable Under Options, Ending balance | shares	2,176
Shares Issuable Under Options, Options vested and expected to vest at March 31, 2016 | shares	1,837
Shares Issuable Under Options, Options exercisable at March 31, 2016 | shares	899
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 14.28
Weighted Average Exercise Price, Granted | $ / shares	17.92
Weighted Average Exercise Price, Exercised | $ / shares	0
Weighted Average Exercise Price, Canceled | $ / shares	16.46
Weighted Average Exercise Price, Ending balance | $ / shares	15.16
Weighted Average Exercise Price, Options vested and expected to vest | $ / shares	14.53
Weighted Average Exercise Price, Options exercisable | $ / shares	$ 10.79