Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Provision for income taxes [Abstract]
Income taxes using U.S federal statutory rate	$ (10,012)	$ (7,666)
Nondeductible interest	127	139
Branch income	(1,230)	(385)
State income taxes, net of federal benefit	(31)	(531)
Foreign rate differential	506	165
Valuation allowance	7,099	9,221
Stock option expense, exercises and cancellations	2,899	752
Research and development costs	(859)	(708)
Other	(179)	(987)
Derivative Charge	1,680	0
Total	$ 0	$ 0