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Income Taxes - Reconciliation of federal statutory income tax to provision for income taxes (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Income Taxes
Expected benefit at statutory federal rate			$ (4,941,000)	$ (6,717,000)
State tax - net of federal benefit			72,000	100,000
Research and development credits				(564,000)
Foreign income/losses taxed at different rates			14,000	15,000
Unrecognized tax benefits			276,000	126,000
Stock-based compensation			8,000	3,000
Interest expense			333,000	233,000
Remeasurements of net defined benefit liabilities			5,000
Exchange rate difference			287,000	551,000
Change in tax rate			(242,000)	(92,000)
True-up deferred taxes			1,382,000	3,254,000
True-up payable			75,000
Accumulated deficit			67,000	10,000
Change in valuation allowance			3,182,000	3,246,000
Other			23,000	(44,000)
Total provision for income taxes	$ 59,000	$ 50,000	$ 541,000	$ 121,000

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to accumulated deficit.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to unrecognized tax benefits.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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