Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid Expenses And Other Current Assets [Line Items]
Equipment maintenance and services	$ 4,601	$ 1,662
Prepaid taxes	2,649	2,719
Prepaid insurance	1,936	80
Other	9,490	1,456
Total prepaid expenses and other current assets	$ 18,676	$ 5,917