Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 6,440	$ 4,346
Deposits	113	112
Interest receivable on marketable securities	304	246
Other	444	408
Total prepaid expenses and other current assets	$ 7,301	$ 5,112