Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance Sheet Components [Abstract]
Accrued salary and payroll-related expenses	$ 872	$ 1,460
Accrued liabilities	376	$ 535
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Operating Lease, Right-of-Use Asset	Operating Lease, Right-of-Use Asset
Income taxes payable	192	$ 464
Advanced billings and accounts receivable credits	636	1,016
Other	23	38
Total accrued expenses and other current liabilities	$ 2,099	$ 3,513