Balance Sheet Components (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Components [Abstract]
Accrued payroll and related expenses	$ 10,019	$ 13,898
Provision for sales returns	508	359
Accrued professional services	2,225	2,039
Operating lease liability	1,750	1,294
Accrued interest payable	393	14
Accrued royalty expense	804	687
Deferred revenue	482	157
Accrued travel expenses	749	590
Accrued clinical expenses	50	99
Accrued other expenses	595	665
Total	$ 17,575	$ 19,802