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Income Taxes
 3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Taxes

6. Income Taxes

For the three months ended March 31, 2022 and 2021, the Company's effective tax rate was (1.1)% and zero, respectively. Section 174 of the Internal Revenue Code requires capitalization of research and development expenses to then be amortized over five years for U.S. based research and 15 years for research conducted outside of the U.S., which limits the amount of research and development expenses that can be used to offset income in the current year. The difference between the effective tax rate as of March 31, 2022 and 2021, respectively, and the U.S. federal statutory rate of 21% was primarily due to the anticipatory recognition of a certain amount of current year income tax as a result of this capitalization effective this year.