Supplemental Financial Information - Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Assets, Noncurrent Disclosure [Abstract]
Noncurrent restricted cash	$ 15,644	$ 15,644
Deferred certification costs	5,182	5,199
Noncurrent deferred contract costs	5,917	6,832
Deferred income taxes	1,627	1,776
Other noncurrent assets	3,545	2,392
Total other assets	$ 31,915	$ 31,843