Balance Sheet Components - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted cash	$ 2,000		$ 2,000
Restricted cash, current	977	$ 276	977
Restricted cash, non-current	1,035	1,004	1,035
Inventory write down	1,800		$ 1,700
Inventory write down	203	0
Depreciation expense	1,300	$ 1,100
Amortization expense	$ 1,100