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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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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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