Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 2.5	$ 1.9
Cash paid for cashflows from operating lease	$ 2.1	$ 1.6
Operating lease, weighted average remaining lease term	11 years		11 years 4 months 24 days
Operating lease, weighted average discount rate, percent	5.80%		5.80%