Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 9,706	$ 3,720
Operating lease liabilities	556	691
Other accruals	71	101
Accrued compensation	399	448
Reserves	169	299
Deferred revenue		642
Intangible assets	56	32
Stock-based compensation	4,605	4,910
Total gross deferred tax assets	15,562	10,843
Deferred tax liabilities:
Property and equipment	(348)	(805)
Operating lease right-of-use assets	(518)	(655)
Other		(61)
Total gross deferred tax liabilities	(866)	(1,521)
Valuation allowance	$ (14,696)	$ (9,322)