Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Total accounts receivable	$ 21,029	$ 23,860
Less: Allowance for doubtful accounts	(217)	(372)
Accounts receivable, net of allowance for doubtful accounts	20,812	23,488
United States
Accounts Notes And Loans Receivable [Line Items]
Total accounts receivable	17,879	18,893
International
Accounts Notes And Loans Receivable [Line Items]
Total accounts receivable	$ 3,150	$ 4,967