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Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Amortization of debt discount			$ 9,028	$ 8,666
Senior Notes | Convertible Note Due 2023
Debt Instrument [Line Items]
Contractual interest expense	$ 1,581	$ 1,581	4,744	4,743
Amortization of debt discount	2,286	2,166	6,766	6,411
Total	$ 3,867	$ 3,747	$ 11,510	$ 11,154
Effective interest rate (as a percent)	5.45%		5.45%

X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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-Publisher FASB
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-Topic 470
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- Definition

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.

+ References

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