Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income taxes For the three and nine months ended September 30, 2020, we recorded an income tax provision of $3.2 million. Our effective tax rate of approximately 1% differed from the federal statutory rate primarily because we maintain a full valuation allowance. The income tax provision recorded is related to estimated state tax liabilities, for which there were limitations on the use of existing state carryforwards against estimated taxable income. We have existing federal tax carryforwards sufficient to offset estimated taxable income. Included in the estimated effective tax rate, we have forecasted a valuation allowance release due to expected utilization of tax attributes in 2020. It also reflected a discrete benefit of $52.1 million primarily offset by a valuation allowance release for stock-based compensation windfalls during the nine months ended September 30, 2020. We have provided a full valuation allowance against the remaining deferred tax assets because based on the weight of available evidence, it is more likely than not some or all of the deferred tax assets will not be realized in the future.

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.