Income Taxes, Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets [Abstract]
Reserves and accruals	$ 65	$ 147
Research and development credits and other credits	1,110	430
Net operating loss carry forward	15,262	11,988
Stock based compensation	4,360	5,018
Other	2,382	970
Total deferred tax assets	23,179	18,553
Valuation allowance	(23,179)	(18,553)
Deferred tax assets after valuation allowance	0	0
Total deferred tax liability - depreciation and amortization	0	0
Net deferred tax assets	$ 0	$ 0