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Debt - (Tables) | 9 Months Ended
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Sep. 30, 2020
Debt Instrument, Redemption [Line Items] |
Summary of liability for sale of future royalties | The following table shows the activity within the “liability for sale of future royalties- current” and “liability for sale of future royalties- noncurrent” accounts for the three and nine month periods ended September 30, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
Liability for sale of future royalties- (current and noncurrent) | ​ | 2020 |  | 2020 |
Beginning balance | ​ | $ | — | ​ | $ | — | ​
Proceeds from sale of future royalties | ​ |  | 650,000 | ​ |  | 650,000 | ​
Less: Non-cash royalty revenue payable to RPI | ​ | ​ | (299) | ​ | ​ | (299) | ​
Plus: Non-cash interest expense recognized | ​ | ​ | 14,557 | ​ | ​ | 14,557 | ​
Ending balance | ​ | $ | 664,258 | ​ | $ | 664,258 | ​
Effective interest rate for the period | ​ |  | 11.0 | % |  | 11.0 | %
1.50% Convertible senior notes due 2026 |
Debt Instrument, Redemption [Line Items] |
Summary of convertible notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liability component |  | September 30, 2020 | ​ | December 31, 2019 | ​
Principal | ​ | $ | 287,500 | ​ | $ | 287,500 | ​
Less: Debt issuance costs | ​ |  | (4,192) | ​ |  | (4,567) | ​
Less: Debt discount, net(1) | ​ |  | (109,563) | ​ |  | (119,350) | ​
Net carrying amount | ​ | $ | 173,745 | ​ | $ | 163,583 | ​
Summary of interest expense recognized related to the Convertible Notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, | ​ | ​ | ​
​ |  | 2020 |  | ​ | 2019 | ​ | ​ | 2020 |  | ​ | 2019 | ​ | ​ | ​
Contractual interest expense | ​ | $ | 1,081 | ​ | $ | 130 | ​ | ​ | $ | 3,223 | ​ | $ | 130 | ​ | ​ | ​
Amortization of debt issuance costs | ​ |  | 127 | ​ | ​ | 15 | ​ | ​ |  | 374 | ​ |  | 15 | ​ | ​ | ​
Amortization of debt discount | ​ | ​ | 3,313 | ​ | ​ | 391 | ​ | ​ | ​ | 9,786 | ​ | ​ | 391 | ​ | ​ | ​
Total | ​ | $ | 4,521 | ​ | $ | 536 | ​ | ​ | $ | 13,383 | ​ | $ | 536 | ​ | ​ | ​
Effective interest rate of the liability component | ​ |  | 10.2 | % | ​ | 10.2 | % | ​ |  | 10.2 | % | ​ | 10.2 | % | ​ | ​
3.00% Convertible senior notes due 2022 |
Debt Instrument, Redemption [Line Items] |
Summary of convertible notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liability component |  | September 30, 2020 |  | December 31, 2019 | ​
Principal | ​ | $ | 150,000 | ​ | $ | 150,000 | ​
Less: Debt issuance costs | ​ |  | (986) | ​ |  | (1,329) | ​
Less: Debt discount, net (1) | ​ |  | (19,794) | ​ |  | (26,686) | ​
Net carrying amount | ​ | $ | 129,220 | ​ | $ | 121,985 | ​
Summary of interest expense recognized related to the Convertible Notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, |  | Nine Months Ended September 30, |  | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | ​
Contractual interest expense | ​ | $ | 1,131 | ​ | $ | 1,134 | ​ | $ | 3,375 | ​ | $ | 3,375 | ​ | ​
Amortization of debt issuance costs | ​ |  | 118 | ​ |  | 106 | ​ |  | 343 | ​ |  | 308 | ​ | ​
Amortization of debt discount | ​ |  | 2,372 | ​ |  | 2,137 | ​ |  | 6,892 | ​ |  | 6,192 | ​ | ​
Total | ​ | $ | 3,621 | ​ | $ | 3,377 | ​ | $ | 10,610 | ​ | $ | 9,875 | ​ | ​
Effective interest rate of the liability component | ​ |  | 11.0 | % |  | 11.0 | % |  | 11.0 | % |  | 11.0 | % | ​

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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