Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expenses And Other Current Assets [Line Items]
Equipment maintenance and services	$ 1,662	$ 1,677
Prepaid taxes	2,719	843
Prepaid insurance	80	629
Deferred costs		55
Other	1,456	697
Total prepaid expenses and other current assets	$ 5,917	$ 3,901