Certain Balance Sheet Accounts - Summary of Changes In Accrued Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accured Warranty Abstract
Accrued warranty, beginning of period	$ 992	$ 892	$ 924	$ 378
Provision for warranties issued during the period	485	334	708	1,427
Settlements of warranty claims during the period	(287)	(300)	(442)	(879)
Accrued warranty, end of period	$ 1,190	$ 926	$ 1,190	$ 926