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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes |
Schedule of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Current: |  | ​ |  |  | ​ |
Federal | ​ | $ | — | ​ | $ | —
State | ​ |  | — | ​ |  | —
Total current expense | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: | ​ |  |  | ​ |  |
Federal | ​ |  | — | ​ |  | —
State | ​ |  | — | ​ |  | —
Total deferred expense | ​ |  | — | ​ |  | —
Total income tax expense | ​ | $ | — | ​ | $ | —
Schedule of reconciliation between the effective tax rate on income from continuing operations | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |
Provision at statutory rate |  | 21.0 | % | 21.0 | %
Stock-based compensation | ​ | (2.0) | ​ | (1.9) | ​
Convertible notes |  | (0.4) |  | (7.5) | ​
Fair value adjustment |  | 4.7 |  | 13.1 | ​
Change in valuation allowance |  | (24.6) |  | (26.3) | ​
Research and development credits | ​ | 1.6 | ​ | 1.6 | ​
Other |  | (0.3) |  | — | ​
Effective tax rate |  | 0.0 | % | 0.0 | %
Schedule of components of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | 2023 |  | 2022
Deferred tax assets: |  | ​ |  |  | ​ |
Net operating loss carryforwards | ​ | $ | 34,157 | ​ | $ | 28,218
Research and development credit carryforwards | ​ |  | 2,599 | ​ |  | 2,006
Accruals and other | ​ |  | 717 | ​ |  | 798
Lease liability | ​ | ​ | 388 | ​ | ​ | 650
Property, equipment and software | ​ |  | 93 | ​ |  | 165
Amortization | ​ |  | 198 | ​ |  | 189
Capitalized research and experimental expenses | ​ | ​ | 2,218 | ​ | ​ | 1,191
Other | ​ |  | 11 | ​ |  | 11
Total deferred tax assets | ​ |  | 40,381 | ​ |  | 33,228
Valuation allowance | ​ |  | (39,989) | ​ |  | (32,702)
Deferred tax assets recognized | ​ |  | 392 | ​ |  | 526
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Right of use asset | ​ | ​ | (392) | ​ | ​ | (526)
Total deferred tax liabilities | ​ |  | (392) | ​ |  | (526)
Net deferred taxes | ​ | $ | — | ​ | $ | —
Schedule of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022
Unrecognized tax benefits as of the beginning of the year | ​ | $ | 430 | ​ | $ | 313
Increases related to prior year tax provisions | ​ |  | 12 | ​ |  | 28
Decrease related to prior year tax provisions | ​ |  | — | ​ |  | —
Increase related to current year tax provisions | ​ |  | 102 | ​ |  | 89
Statute lapse | ​ |  | — | ​ |  | —
Unrecognized tax benefits as of the end of the year | ​ | $ | 544 | ​ | $ | 430

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