Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Minimum term of non-cancellable operating leases	1 year
Expiration of non-cancellable operating leases maximum year	2030
Operating lease expenses	$ 3.4	$ 1.6	$ 1.4
Operating lease not yet commenced	the Company had no leases that have not yet commenced.
Purchase commitment, paid	$ 13.7	$ 10.0	$ 6.7
Future minimum purchase commitment 2020	9.7
Future minimum purchase commitment 2021	2.9
Future minimum purchase commitment 2022	0.2
Future minimum purchase commitment 2023	0.2
Future minimum purchase commitment 2024	$ 0.6