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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred tax assets |  |
Net operating loss carryforwards | $ 79,078 | $ 78,583
Capitalized costs | 5,409 | 3,095
Accruals and reserves | 4,610 | 4,830
Inventory reserves | 267 | 402
Stock compensation | 382 | 368
Loss on unrealized currency translation | 166 | 160
Research and development credits | 2,490 | 2,490
Financial guarantee liabilities | 5,410 | 5,320
Lease liability | 197 | 4
Provision for credit losses | 368 | 119
Gross deferred tax assets | 98,377 | 95,371
Valuation allowance | (97,628) | (94,446)
Net deferred tax assets | 749 | 925
Deferred tax liabilities |  |
Revaluation of convertible promissory notes | (448) | (742)
Contract assets | (3) | (8)
ROU assets | (298) | (175)
Gross deferred tax liabilities | (749) | (925)
Increase in valuation allowance | $ 3,200 | $ 3,200

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