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Income Taxes
6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Income Taxes Income TaxesFor the three months ended June 30, 2020 and 2019, the Company recorded income tax expense of $2.4 million and less than $0.1 million, respectively. For the six months ended June 30, 2020 and 2019, the Company recorded income tax expense of $3.1 million and less than $0.1 million, respectively. The income tax expense for the three and six months ended June 30, 2020 was primarily driven by the estimated effective tax rate for the year and the discrete impact of net shortfall tax expense related to stock-based compensation activity. As a result of the tax valuation allowance against deferred tax assets in the U.S., there was no benefit for federal income taxes associated with the income before taxes for the three and six months ended June 30, 2019. Income taxes were recorded related to certain U.S. state and foreign jurisdictions for the three and six months ended June 30, 2019.The Company assesses the need for a valuation allowance against its deferred tax asset each quarter through the review of all available positive and negative evidence. Deferred tax assets are reduced by a tax valuation allowance when, in the opinion of management, it is more likely than not that some portion of the deferred tax assets will not be realized. The analysis depends on historical and projected taxable income. Projected taxable income includes significant assumptions related to revenue, commercial expenses and research and development activities. During the third quarter of 2019, after considering all available positive and negative evidence, including but not limited to cumulative income in recent periods, historical, current and future projected results and significant risks and uncertainties related to forecasts, the Company concluded that it was more likely than not that substantially all of its deferred tax assets in the U.S. are realizable in future periods. A valuation allowance was retained against certain District of Columbia state deferred tax assets as of June 30, 2020 and December 31, 2019.