Stock-Based Compensation - Summary of Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Issuable Under Options, Beginning balance | shares	3,268,000
Shares Issuable Under Options, Granted | shares	280,000
Shares Issuable Under Options, Exercised | shares	(59,000)
Shares Issuable Under Options, Cancelled | shares	(23,000)
Shares Issuable Under Options, Ending balance | shares	3,466,000
Shares Issuable Under Options, Options vested and expected to vest at March 31, 2017 | shares	3,466,000
Shares Issuable Under Options, Options exercisable at March 31, 2017 | shares	1,337,000
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 14.84
Weighted Average Exercise Price, Granted | $ / shares	19.74
Weighted Average Exercise Price, Exercised | $ / shares	9.47
Weighted Average Exercise Price, Cancelled | $ / shares	17.86
Weighted Average Exercise Price, Ending balance | $ / shares	16.20
Weighted Average Exercise Price, Options vested and expected to vest | $ / shares	16.20
Weighted Average Exercise Price, Options exercisable | $ / shares	$ 13.28