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Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes The Company recognized an income tax benefit of $1.0 million and $0.7 million during the three and six months ended June 30, 2021, respectively, due to the current period income before income taxes and the application of the annual effective tax rate. The annual effective tax rate relates primarily to an expected income tax liability due to the acceleration of revenue recognition for tax purposes related to the Amended Sanofi Agreement. There was no income tax benefit recognized during the three and six months ended June 30, 2020. Net operating losses generated in 2018 and years thereafter can be carried forward indefinitely.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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