Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Balance Sheet Components [Abstract]
Accrued salary and payroll-related expenses	$ 3,091	$ 2,309
Deferred strategic agreement revenues	0	1,657
Accrued liabilities	962	848
Finance lease liabilities	$ 0	$ 15
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total accrued expenses and other current liabilities	Total accrued expenses and other current liabilities
Income taxes payable	$ 336	$ 0
Advanced billings	334	404
Other	1,453	1,319
Total accrued expenses and other current liabilities	$ 6,176	$ 6,552