Balance Sheet Accounts (Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and employee related expenses	$ 4,243	$ 4,152
Lease liability - short-term [Extensible Enumeration]	Total	Total
Lease liability – short-term	$ 2,909	$ 1,909
Accrued product warranty	1,289	1,271
Accrued legal expenses	707	606
Other	1,062	463
Total	$ 10,210	$ 8,401