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Debt - Schedule of Net Carrying Amount of the Liability Component of the Notes (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | May 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal | $ 258,781 |  |
Total debt, net carrying value | 190,646 |  | $ 32,930
Convertible debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 190,615 |  | $ 0
Convertible debt | Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 258,750 |  |
Debt Instrument, Unamortized Discount | (62,174) |  |
Unamortized issuance costs | (5,961) | $ (6,100) |
Total debt, net carrying value | $ 190,615 |  |

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