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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of Temporary Differences Between Basis of Deferred Tax Assets and Liabilities | Deferred taxes are recognized for temporary differences between the basis of assets and liabilities for financial statement and income tax purposes. Deferred tax assets consist of the following (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 76,802 |  |  | $ | 61,181 |
Tax credit carryforwards |  |  | 7,248 |  |  |  | 5,748 |
Accrued expenses |  |  | 181 |  |  |  | 126 |
Property and equipment |  |  | 591 |  |  |  | 279 |
Lease liabilities |  |  | 5,618 |  |  |  | 6,230 |
Equity compensation |  |  | 2,396 |  |  |  | 2,200 |
Amortizable intangibles |  |  | 1,197 |  |  |  | 1,195 |
Other |  |  | 238 |  |  |  | 74 |
Gross deferred tax assets |  |  | 94,271 |  |  |  | 77,033 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Right of use assets |  |  | (3,794 | ) |  |  | (4,242 | )
Gross deferred tax liabilities |  |  | (3,794 | ) |  |  | (4,242 | )
Valuation allowance |  |  | (90,477 | ) |  |  | (72,791 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
Reconciliation of Statutory Federal Income Tax Rate to Company's Effective Income Tax Rate | A reconciliation of the statutory federal income tax rate to the Company’s effective income tax rate is as follows:
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |
|  | Tax Rate |  |  | Tax Rate |
U.S. federal statutory rate |  |  | 21 | % |  |  | 21 | %
State income taxes, net of federal benefit |  |  | 6 | % |  |  | 6 | %
Other permanent differences |  |  | 0 | % |  |  | (1 | )%
Tax credits |  |  | 2 | % |  |  | 2 | %
Other items |  |  | 0 | % |  |  | 4 | %
Net change in valuation allowance |  |  | (29 | )% |  |  | (32 | )%
Effective income tax rate |  |  | — |  |  |  | — |
Schedule of Valuation Allowance | A roll-forward of the valuation allowance for the years ended December 31, 2021 and 2020 is as follows (in thousands):
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |
Balance at beginning of year |  | $ | (72,791 | ) |  | $ | (53,834 | )
Increase in valuation allowance |  |  | (17,686 | ) |  |  | (18,957 | )
Balance at end of year |  | $ | (90,477 | ) |  | $ | (72,791 | )

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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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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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