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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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- Definition 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. + References No definition available. + Details
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- Definition 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 exchange rate difference. + References No definition available. + Details
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- Definition 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 remeasurements of net defined benefit liabilities. + References No definition available. + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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