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Income Taxes
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes
12.
Income Taxes

The Company’s effective income tax rate was 0.3% and 0.0% for the three months ended September 30, 2021 and 2020, respectively, and 0.7% and 0.0% for the nine months ended September 30, 2021 and 2020, respectively. The income tax provision was $62 thousand and $0 for the three months ended September 30, 2021 and 2020, respectively, and $115 thousand and $0 for the nine months ended September 30, 2021 and 2020, respectively. The change in the provision for income taxes for the three and nine months ended September 30, 2021, respectively, compared to the three and nine months ended September 30, 2020 was primarily due to taxable deferred revenue partially offset by the utilization of federal and state net operating losses and federal and state tax credits.
 

The effective income tax rate for the three and nine months ended September 30, 2021 and 2020 differed from the federal statutory rate primarily due to the valuation allowance maintained against the Company’s deferred tax assets.