Quarterly report pursuant to Section 13 or 15(d)

Income Taxes

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Income Taxes
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The following table includes the Company’s income (loss) before income tax provision (benefit), income tax provision (benefit) and effective tax rate:
  Three Months Ended
  March 31,
  2021 2020
(in thousands)
Income (loss) before income tax benefit $ 9,347  $ (9,154)
Income tax benefit (5,588) (1,964)
Effective tax rate (59.8) % 21.5  %

For the three months ended March 31, 2021, the Company’s effective tax rate differed from the statutory rate primarily due to the increase in the valuation allowance the Company has placed on a portion of its U.S. deferred tax assets, permanent book-tax differences, and the impact of state and local taxes offset by federal and state research and development (“R&D”) credits.

For the three months ended March 31, 2020, the Company's effective tax rate differed from the statutory rate primarily due to the increase in the valuation allowance the Company had placed on a portion of its US deferred tax assets offset by the windfall from stock-based compensation and the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) net operating loss carryback.