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Debt - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Convertible Notes | 2016 Convertible Notes
Interest expense
Contractual interest expense	$ 20,933	$ 16,483
Amortization of debt discount	1,267	2,381
Amortization of deferred financing	$ 527	$ 165
Effective interest rate of the liability component	10.60%	10.60%
Senior Notes
Interest expense
Effective interest rate of the liability component	8.40%	10.20%

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- Definition

Amortization of specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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