Long-Term Debt - Convertible Senior Notes (Details) - USD ($)
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3 Months Ended |
9 Months Ended |
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May 01, 2020 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2019 |
May 05, 2015 |
| Carrying amount of Notes on the balance sheet: |
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| Purchases of Convertible Notes |
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$ (88,961,000)
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$ (33,915,000)
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| Settlement of Convertible Notes |
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| Carrying amount of Notes on the balance sheet: |
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| Purchases of Convertible Notes |
$ (69,200,000)
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| Senior Notes |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
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250.00%
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| Repurchased face amount |
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$ 89,100,000
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$ 34,300,000
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89,100,000
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34,300,000
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| Repayments of debt |
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89,000,000.0
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33,900,000
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| Gain (loss) on extinguishment of debt |
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0
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0
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166,000
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711,000
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| Repurchase amount |
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0
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0
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0
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0
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| Carrying amount of Notes on the balance sheet: |
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| Convertible senior notes, principal amount |
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0
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0
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$ 158,295,000
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| Unamortized debt discount |
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0
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0
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(1,667,000)
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| Unamortized debt issuance costs |
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0
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0
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(330,000)
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| Convertible senior notes, net |
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0
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0
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$ 156,298,000
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| Contractual coupon interest |
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0
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989,000
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1,063,000
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3,254,000
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| Debt discount amortization |
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0
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1,208,000
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1,196,000
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3,934,000
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| Amortization of debt issuance costs |
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0
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239,000
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236,000
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778,000
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| Interest expense |
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$ 0
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$ 2,436,000
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$ 2,662,000
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$ 8,677,000
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| Interest on Convertible Debt, Net of Tax |
$ 900,000
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