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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes |
Schedule of domestic and foreign components of income (loss) before provision for income taxes | The domestic and foreign components of income (loss) before provision for income taxes were as follows for the years ended December 31:
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022
Domestic | ​ | $ | (19,910) | ​ | $ | (30,559)
Foreign | ​ |  | (2,018) | ​ |  | 4,268
Loss before provision for income taxes | ​ | $ | (21,928) | ​ | $ | (26,291)
Schedule of provision for income taxes | The provision for income taxes for the years ended December 31, 2023 and 2022 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022
Current |  | ​ |  |  | ​ |
Federal | ​ | $ | 215 | ​ | $ | 128
State | ​ |  | 1 | ​ |  | 1
Foreign | ​ |  | 325 | ​ |  | (8)
Total current | ​ |  | 541 | ​ |  | 121
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred | ​ |  |  | ​ |  |
Federal | ​ |  | — | ​ |  | —
State | ​ |  | — | ​ |  | —
Foreign | ​ |  | — | ​ |  | —
Total deferred | ​ |  | — | ​ |  | —
Total provision for income taxes | ​ | $ | 541 | ​ | $ | 121
Schedule of reconciliation of federal statutory income tax to provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022
Expected benefit at statutory federal rate | ​ | $ | (4,941) | ​ | $ | (6,717)
State tax — net of federal benefit | ​ |  | 72 | ​ |  | 100
Research and development credits | ​ |  | — | ​ |  | (564)
Foreign income/losses taxed at different rates | ​ |  | 14 | ​ |  | 15
Unrecognized tax benefits | ​ |  | 276 | ​ |  | 126
Stock-based compensation | ​ |  | 8 | ​ |  | 3
Interest expense | ​ |  | 333 | ​ |  | 233
Remeasurements of net defined benefit liabilities | ​ |  | 5 | ​ |  | —
Exchange rate difference | ​ |  | 287 | ​ |  | 551
Change in tax rate | ​ |  | (242) | ​ |  | (92)
True-up deferred taxes | ​ |  | 1,382 | ​ |  | 3,254
True-up payable | ​ |  | 75 | ​ |  | —
Accumulated deficit | ​ |  | 67 | ​ |  | 10
Change in valuation allowance | ​ |  | 3,182 | ​ |  | 3,246
Other | ​ |  | 23 | ​ |  | (44)
Total provision for income taxes | ​ | $ | 541 | ​ | $ | 121
Schedule of significant components of deferred tax assets and liabilities |
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 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)
Net deferred income tax | ​ | $ | — | ​ | $ | —
Schedule of reconciliation of the unrecognized tax benefits ("UTBs") | A reconciliation of the unrecognized tax benefits (“UTBs”) as of December 31, 2023 and 2022 is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022
Beginning gross UTBs | ​ | $ | 3,203 | ​ | $ | 3,106
Additions for tax positions taken in a prior year | ​ |  | — | ​ |  | (35)
Additions for tax provision taken in the current year | ​ |  | 319 | ​ |  | 1,093
Adjustments for tax positions for changes in currency translation | ​ |  | 95 | ​ |  | (223)
Reductions for tax positions taken in the prior year | ​ |  | 1,051 | ​ |  | (270)
Reductions for tax positions taken in the prior year due to statutes lapsing | ​ |  | (1,585) | ​ |  | (468)
Ending gross UTBs | ​ |  | 3,083 | ​ |  | 3,203
UTBs offset by deferred tax assets and/or valuation allowance | ​ |  | (1,419) | ​ |  | (1,714)
Net UTBs | ​ | $ | 1,664 | ​ | $ | 1,489

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