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Income Taxes
 6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The Company’s effective tax rates for the three and six months ended June 30, 2021 and 2022, are as follows:

Three Months Ended June 30,Six Months Ended June 30,
2021202220212022
(Benefit) provision for income taxes$(988)$24 $(767)$43 
Effective tax rate(3.33)%(0.08)%(1.92)%1.49 %

The Company's tax provision and the resulting effective tax rate for interim periods is determined based upon its estimated annual effective tax rate adjusted for the effect of discrete items arising during the period. The increase in the effective tax rate for the three and six months ended June 30, 2022 was primarily driven by an increase in the Company's state tax liabilities in 2022. Compared to the same periods in 2021, the Company’s effective tax rate in 2022 has normalized from a partial valuation allowance release driven by an acquisition that occurred during the three months ended June 30, 2021. The effective tax rate differs from the U.S. statutory tax rate primarily due to the valuation allowance on the Company’s deferred tax assets as it is more likely than not that some or all of these deferred tax assets will not be realized.