Income Taxes - Tax Effects of Temporary Differences and Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets [Abstract]
Inventory reserve	$ 12	$ 11
Allowance for doubtful accounts	20	19
Lease liability	31	48
Other reserves and accruals	17	72
Unrealized gains on marketable securities	166
Stock-based compensation	8	41
Depreciation and amortization	11	9
Tax credit carryforwards		318
Federal tax loss carryforwards		23
Total deferred income taxes	265	541
Total deferred income tax liabilities	31	1,072
Net deferred tax assets (liabilities)	234	531
Deferred Tax Liabilities [Abstract]
Unrealized gains on marketable securities		1,024
Right-of-Use Asset	31	48
Total deferred income tax liabilities	31	1,072
Net deferred tax assets (liabilities)	$ 234	$ 531