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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Taxes |
Schedule of reconciliation of U.S. statutory income tax rate to effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ |  | 2021 |  | 2020 |
Federal income tax (benefit) at statutory rate | ​ | 21.00 | % | 21.00 | %
Permanent differences |  | (0.25) | ​ | (0.41) | ​
Federal research and development credits and adjustments |  | 0.44 | ​ | 2.78 | ​
Nondeductible research costs | ​ | (17.75) | ​ | — | ​
State income tax, net of federal benefit |  | 0.82 | ​ | 6.03 | ​
Other |  | 0.01 | ​ | 0.37 | ​
Change in valuation allowance | ​ | (4.27) | ​ | (29.77) | ​
Effective income tax rate | ​ | — | % | — | %
​
Schedule of components of deferred tax assets | The Company’s deferred tax assets consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 |  | 2020
Deferred tax assets | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforwards | ​ | $ | 75,849 | ​ | $ | 65,373
Tax credit carryforwards | ​ | ​ | 10,063 | ​ | ​ | 9,273
Capitalized research and development | ​ | ​ | 139 | ​ | ​ | 482
Capitalized legal expenses | ​ | ​ | 1,048 | ​ | ​ | 1,070
Lease liability | ​ | ​ | 99 | ​ | ​ | 284
Other differences | ​ | ​ | 1,977 | ​ | ​ | 1,648
Total deferred tax assets | ​ | ​ | 89,175 | ​ | ​ | 78,130
Deferred tax liabilities | ​ | ​ | ​ | ​ | ​ | ​
ROU asset | ​ | ​ | (107) | ​ | ​ | (262)
Valuation allowance | ​ | ​ | (89,068) | ​ | ​ | (77,868)
Net deferred tax assets | ​ | $ | — | ​ | $ | —
​

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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 http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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