Stock Based Compensation - Summary of Stock Option Plans (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 shares
Disclosure Stock Based Compensation Stock Option Plan [Abstract]
Shares, Outstanding, Beginning balance | shares	1,715,316
Shares, Assumed | shares	117,116
Shares, Granted | shares	183,551
Shares, Exercised | shares	(14,994)	(47,960)
Shares, Forfeited or expired | shares	(8,915)
Shares, Outstanding, Ending balance | shares	1,992,074
Shares, Exercisable at June 30, 2020 | shares	1,446,719
Aggregate Intrinsic Value, Outstanding at June 30, 2020 | $	$ 2,513
Aggregate Intrinsic Value, Exercisable at June 30, 2020 | $	$ 2,513
Weighted Average Remaining Contractual Term, Outstanding at June 30, 2020	5 years 6 months
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2020	4 years 4 months 24 days
Weighted Average Exercise Price, Outstanding, Beginning balance | $ / shares	$ 34.49
Weighted Average Exercise Price, Assumed | $ / shares	12.14
Weighted Average Exercise Price, Granted | $ / shares	32.51
Weighted Average Exercise Price, Exercised | $ / shares	20.48
Weighted Average Exercise Price, Forfeited or expired | $ / shares	28.47
Weighted Average Exercise Price, Outstanding, Ending balance | $ / shares	33.13
Weighted Average Exercise Price, Exercisable | $ / shares	$ 31.67