Share-Based Compensation - Summary of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning balance of Outstanding, Options | shares	2,818,000
Granted, Options | shares	42,000
Exercised, Options | shares	(194,000)
Cancelled, Options | shares	(164,000)
Ending balance of Outstanding, Options | shares	2,502,000
Exercisable, Options | shares	1,947,000
Beginning balance of Outstanding, Weighted Average Exercise Price | $ / shares	$ 9.59
Granted, Weighted Average Exercise Price | $ / shares	21.29
Exercised, Weighted Average Exercise Price | $ / shares	5.73
Cancelled, Weighted Average Exercise Price | $ / shares	22.62
Ending balance of Outstanding, Weighted Average Exercise Price | $ / shares	9.23
Exercisable, Weighted Average Exercise Price | $ / shares	$ 9.01