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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The provision for income taxes consists of the following (in thousands):

Years Ended December 31,
20202019
Current:
Federal$— $— 
State27 
Total current27 
Deferred:
Federal(117)10 
State11 10 
Total deferred(106)20 
(Benefit) provision for income tax$(79)$25 
Schedule of Effective Income Tax Rate Reconciliation
The effective tax rate of our provision for income taxes differs from the federal statutory rate as follows:

Years Ended December 31,
20202019
Federal statutory tax rate(21.0)%(21.0)%
State income taxes, net of federal tax benefits(3.9)%(3.6)%
Change in fair value of preferred stock liabilities— %(0.5)%
Change in valuation allowance22.6 %(36.1)%
Limitation of net operating losses— %59.8 %
Other1.8 %1.6 %
Effective tax rate(0.5)%0.2 %
Schedule of Deferred Tax Assets and Liabilities If the Company’s judgment changes and it is determined that the Company will be able to realize these deferred tax assets, the tax benefits relating to any reversal of the valuation allowance on deferred tax assets will be accounted for as a reduction to income tax expense (in thousands).
December 31,
20202019
Deferred tax assets:
Net operating loss carryforwards$17,733 $15,287 
Research and development tax credits629 419 
Accruals, reserves and other1,448 590 
Interest expense1,306 744 
Basis differences in fixed and intangible assets117 225 
Total gross deferred tax assets21,233 17,265 
Less: Valuation allowance(20,596)(16,797)
Deferred tax assets, net637 468 
Deferred tax liabilities:
Financing and acquisition-related liabilities(336)(336)
Indefinite lived assets(459)(396)
Deferred tax liabilities, net(795)(732)
Net deferred tax liabilities$(158)$(264)
Summary of Valuation Allowance
Changes in the valuation allowance for deferred tax assets during the years ended December 31, 2020 and 2019, which related primarily to increases in net operating loss carryforwards, accrued revenue and accruals and reserves were as follows (in thousands):
December 31,
20202019
Valuation allowance at the beginning of the year$16,797 $21,138 
Decreases recorded as benefits to income tax provision— (4,341)
Increases recorded to income tax provision3,799 — 
Valuation allowance at the end of the year$20,596 $16,797