Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Accounts receivable	$ 957	$ 737
Accrued expenses	154	602
Net operating loss carryforwards	44,049	23,779
Warrant liability	0	3,276
Stock-based compensation	5,513	1,573
Rent payable	499	629
Tax credit carryforwards	70	0
Other	570	121
Gross deferred tax assets	51,812	30,717
Deferred tax liability
Depreciation and amortization	(9,226)	(9,896)
Gross deferred tax liability	(9,226)	(9,896)
Less: valuation allowance	(42,919)	(20,950)	$ (15,372)
Total net deferred tax liability	$ (333)	$ (129)