Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Total accounts receivable	$ 12,279	$ 8,482
Less: Allowance for doubtful accounts	(331)	(239)
Accounts receivable, net of allowance for doubtful accounts	11,948	8,243
United States
Accounts Notes And Loans Receivable [Line Items]
Total accounts receivable	8,159	5,574
International
Accounts Notes And Loans Receivable [Line Items]
Total accounts receivable	$ 4,120	$ 2,908