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Debt - Components (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	May 12, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Fair value of embedded derivative	$ 2,900		$ 4,600
Term Loan | Secured Debt
Debt Instrument [Line Items]
Principal amount				$ 47,500
Unamortized debt discount and debt issuance costs				(962)
Net carrying amount				46,538
2025 Notes | Convertible Debt
Debt Instrument [Line Items]
Principal amount	166,898		180,400
Fair value of embedded derivative	2,929
Unamortized debt discount	(3,915)
Unamortized issuance costs	(3,073)
Net carrying amount	162,839
2022 Notes | Convertible Debt
Debt Instrument [Line Items]
Principal amount	0	$ 2	$ 45,000	105,125
Unamortized debt discount and debt issuance costs	0			(3,791)
Net carrying amount	$ 0			$ 101,334

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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