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Summary of Significant Accounting Policies New Accounting Pronouncements - Recent Pronouncements (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 01, 2021	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt		$ 47,215	$ 47,215
Retained Earnings (Accumulated Deficit)				$ (485,043)	$ (438,773)
Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Instrument, Unamortized Discount and Debt Issuance Cost	$ 68,800
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	80,100
Retained Earnings (Accumulated Deficit)	$ 11,300

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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