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Debt Instruments - Convertible Debt (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 21, 2016 USD ($) $ / shares shares | Dec. 15, 2016 $ / item | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Convertible Debt |  |  |  |  |
Debt instrument term |  |  |  |  | 7 years
Equity component of the Convertible Notes |  |  |  |  | $ 88,300,000
Deferred tax liability in relation to the Convertible Notes |  |  |  |  | 29,800,000
Convertible Notes | 2016 Convertible Notes |  |  |  |  |
Convertible Debt |  |  |  |  |
Aggregate principle amount | $ 250,000,000 |  |  |  |
Net proceeds after deducting fees and estimated expenses | 243,000,000 |  |  |  |
Net proceeds from convertible notes to pay capped call transactions | $ 13,500,000 |  |  |  |
Shares of common stock issued per increment of note principal | shares | 40,849,675 |  |  |  |
Debt conversion ratio (in shares) | 0.1633987 |  |  |  |
Increment used for debt conversion | $ 1,000 |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 6.12 |  |  |  |
Maximum calendar days allowed to holders of common stock rights options or warrants to purchase of common stock | 60 days |  |  |  |
Trading days for price per share based on last reported sale price | 10 days |  |  |  |
Minimum percentage of per share value of last reported sale price of common stock | 10.00% |  |  |  |
Convertible notes issuance costs | $ 7,500,000 |  |  |  |
Convertible notes issuance cost paid | $ 6,900,000 |  |  |  |
Liability components of convertible notes |  |  |  |  |
Principal |  |  | $ 250,000,000 | $ 250,000,000 | 250,000,000
Less: debt discount |  |  | (83,972,000) | (83,972,000) | (90,807,000)
Less: deferred financing |  |  | (4,393,000) | (4,393,000) | (4,729,000)
Net carrying value of the debt |  |  | 161,635,000 | 161,635,000 | $ 154,464,000
Fair value of the debt |  |  | 644,000,000 | 644,000,000 |
Interest expense |  |  |  |  |
Contractual interest expense |  |  | 1,887,000 | 5,641,000 |
Amortization of debt discount |  |  | 2,342,000 | 6,835,000 |
Amortization of deferred financing |  |  | 122,000 | 344,000 |
Total interest expense |  |  | $ 4,351,000 | $ 12,820,000 |
Effective interest rate of the liability component |  |  | 10.85% | 10.85% |
Initial cap price | $ / item |  | 7.20 |  |  |
Capped call premium on closing price |  | 50.00% |  |  |
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 1 |  |  |  |  |
Convertible Debt |  |  |  |  |
Threshold consecutive trading days | 30 days |  |  |  |
Threshold percentage | 130.00% |  |  |  |
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 1 | Minimum |  |  |  |  |
Convertible Debt |  |  |  |  |
Threshold trading days | 20 days |  |  |  |
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 2 |  |  |  |  |
Convertible Debt |  |  |  |  |
Increment used for debt conversion | $ 1,000 |  |  |  |
Threshold trading days | 5 days |  |  |  |
Threshold consecutive trading days | 5 days |  |  |  |
Maximum threshold percentage | 98.00% |  |  |  |
Over-allotment Option | Private Placement Purchase Agreement | Convertible Notes | 2016 Convertible Notes |  |  |  |  |
Convertible Debt |  |  |  |  |
Aggregate principle amount | $ 25,000,000 |  |  |  |

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