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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Taxes [Abstract] |
Components of Provision for Income Taxes | The components of our provision for income taxes are as follows for the periods indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | Year Ended December 31,
(in thousands) | ​ | ​ | 2022 | ​ |  | 2021
Current | ​ | ​ | ​ | ​ | ​ | ​
Federal and state | ​ | $ | — | ​ | $ | —
Foreign | ​ |  | 109 | ​ |  | 91
Total provision for income taxes | ​ | $ | 109 | ​ | $ | 91
​ | ​ | ​ | ​ | ​ | ​ | ​
Reconciliation of Taxes at the Federal Statutory Rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | Year Ended December 31,
(in thousands) | ​ | ​ | 2022 | ​ |  | 2021
Current | ​ | ​ | ​ | ​ | ​ | ​
Federal and state | ​ | $ | — | ​ | $ | —
Foreign | ​ |  | 109 | ​ |  | 91
Total provision for income taxes | ​ | $ | 109 | ​ | $ | 91
​ | ​ | ​ | ​ | ​ | ​ | ​
Components of Net Deferred Tax Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | Year Ended December 31,
​ | ​ | ​ | 2022 | ​ |  | 2021 |
Tax at federal statutory rate | ​ | ​ | 21.0 | % | ​ | 21.0 | %
Permanent differences | ​ | ​ | (2.1) | ​ | ​ | (9.0) | ​
Research and development ("R&D") tax credit | ​ | ​ | 0.8 | ​ | ​ | 0.9 | ​
Uncertain tax position | ​ | ​ | (0.3) | ​ | ​ | (0.2) | ​
State, net of federal benefit | ​ | ​ | (0.5) | ​ | ​ | (0.7) | ​
Deferred rate change | ​ | ​ | 0.3 | ​ | ​ | 2.5 | ​
Change in valuation allowance | ​ |  | (19.5) | ​ |  | (14.7) | ​
Total | ​ | ​ | (0.3) | % | ​ | (0.2) | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ Significant components of net deferred tax assets were as follows for the periods indicated:
Changes to Gross Unrecognized Tax Benefits | The changes to our gross unrecognized tax benefits were as follows of the periods indicated:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | Year Ended December 31,
(in thousands) | ​ | ​ | 2022 | ​ |  | 2021
Gross unrecognized tax benefits at beginning of year | ​ | $ | 1,939 | ​ | $ | 1,840
Gross increases: | ​ | ​ | ​ | ​ | ​ | ​
Prior year tax positions | ​ | ​ | 4 | ​ | ​ | 10
Current year tax positions | ​ | ​ | 113 | ​ | ​ | 91
Gross decreases: | ​ | ​ | ​ | ​ | ​ | ​
Prior year tax positions | ​ | ​ | (10) | ​ | ​ | (2)
Gross unrecognized tax benefits at end of year | ​ | $ | 2,046 | ​ | $ | 1,939
​

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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