Balance Sheet Components - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventory write down	$ 2,200		$ 2,700
Inventory obsolescence impairment	0	$ 1,483
Depreciation expense	$ 1,100	$ 800