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Income Taxes
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The following table summarizes the Company's loss before income taxes and provision for (benefit from) income taxes (in thousands):
Three Months Ended
September 30,
Nine Months Ended
September 30,
2021202020212020
Loss before income taxes$(54,698)$(2,733)$(174,117)$(42,505)
Provision for (benefit from) income taxes14 2,562 649 (4,098)
Effective tax rate— %(93.7)%(0.4)%9.6 %

The quarterly income tax provision reflects an estimate of the corresponding year’s annual effective tax rate and includes, when applicable, adjustments for discrete items. The tax provision for the periods presented primarily relates to income taxes of non-U.S. operations as the U.S. operations were in a loss position and the Company maintains a full valuation allowance against its U.S. deferred tax assets.

The Company is subject to income taxes in the United States, China, Germany and India. The Company’s effective tax rate changed from 9.6% in the nine months ended September 30, 2020 to (0.4)% in the nine months ended September 30, 2021. This change was primarily due to the $6.7 million tax benefit related to the release of a valuation allowance associated with carrying back a portion of our 2019 net operating losses to 2017 that is allowed by the CARES Act in the first quarter of 2021.
Enacted on March 27, 2020, the CARES Act provides emergency assistance and health care response for businesses affected by the coronavirus pandemic. The CARES Act, among other things, permits net operating loss carryovers and carrybacks to offset 100% of taxable income for taxable years beginning before 2021. Additionally, the CARES Act allows net operating losses incurred in 2018, 2019 and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. In May 2020, the Company received a $7.1 million tax refund related to the carryback of a portion of its 2019 net operating losses to 2017. As of December 31, 2020, the Company had $173.5 million of U.S. federal and $105.5 million of state net operating loss carryforwards available to reduce future taxable income, which will be carried forward indefinitely for U.S. federal tax purposes and will expire beginning in 2028 through 2040 for state tax purposes. Based on the Company’s analysis, the relief provisions will not have additional material impact on its 2021 consolidated financial statements.