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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deferred tax assets: |  |
Federal and state operating loss carryforwards | $ 370 | $ 19,904
Foreign operating loss carryforwards | 176 | 324
Acquired intangibles | 3,095 | 1,683
Stock-based compensation | 467 | 276
Lease Liability |  | 17
Capitalized R&D Costs | 278 | 7,023
Other | 16 | 44
Research and development credit carryforwards | 26 | 1,483
Total deferred tax assets | 4,428 | 30,754
Valuation allowance | (4,400) | (30,800)
Total deferred tax assets, net of valuation allowance |  | 20
Deferred tax liabilities: |  |
ROU Asset |  | (18)
Other |  | (2)
Domestic |  |
Deferred tax assets: |  |
Valuation allowance | (4,252) | (30,410)
Foreign |  |
Deferred tax assets: |  |
Valuation allowance | $ (176) | $ (324)

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