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Long-Term Debt - Carrying Value of 2024 Notes and 2020 Notes (Details) - Convertible Debt - USD ($)	Sep. 30, 2019	Jun. 03, 2019	Dec. 31, 2018	Mar. 11, 2015
Debt Instrument [Line Items]
Principal	$ 494,909,000		$ 316,000,000
Unamortized interest discount	(69,530,000)
Deferred financing costs	(6,243,000)
Net carrying amount of 2024 and 2020 Notes	419,136,000		298,951,000
Convertible Notes 2024
Debt Instrument [Line Items]
Principal	400,000,000	$ 400,000,000.0
Unamortized interest discount	(67,857,000)
Deferred financing costs	(6,069,000)	$ (1,600,000)
Net carrying amount of 2024 and 2020 Notes	326,074,000
Convertible Notes 2020
Debt Instrument [Line Items]
Principal	94,909,000		316,000,000	$ 316,000,000.0
Unamortized interest discount	(1,673,000)		(15,428,000)
Deferred financing costs	(174,000)		(1,621,000)
Net carrying amount of 2024 and 2020 Notes	$ 93,062,000		$ 298,951,000

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Face (par) amount of debt instrument at time of issuance.

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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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