Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Tax withholdings	$ 22,799	$ 0
Receivable from exercised options	4,753	0
Prepaid expenses	4,600	4,368
Other current assets	2,839	2,411
Prepaid expenses and other current assets	$ 34,991	$ 6,779