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Debt Instruments and Related Party Transactions - Convertible Debt (Details) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 21, 2016 USD ($) D $ / shares shares | Dec. 15, 2016 $ / item | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Convertible Debt |  |  |  |  |
Net proceeds from convertible notes to pay capped call transactions |  |  |  |  | $ 13,450,000
Equity component of the Convertible Notes |  |  |  |  | 88,346,000
Deferred tax liability in relation to the Convertible Notes |  |  | $ 29,845,000 | $ 18,991,000 | 29,845,000
Convertible notes issuance costs |  |  | 2,709,000 |  | 2,709,000
Convertible Notes | 2016 Convertible Notes |  |  |  |  |
Convertible Debt |  |  |  |  |
Aggregate principal amount |  |  | 250,000,000 |  | 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% |  |  |  |
Debt instrument term | 7 years |  |  |  |
Equity component of the Convertible Notes | $ 88,300,000 |  |  |  |
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 |  |  | (90,807,000) | (81,566,000) | (90,807,000)
Less: deferred financing |  |  | (4,729,000) | (4,267,000) | (4,729,000)
Net carrying value of the debt |  |  | $ 154,464,000 | 164,167,000 | 154,464,000
Fair value of the debt |  |  |  | 633,400,000 |
Interest expense |  |  |  |  |
Contractual interest expense |  |  |  | 7,528,000 | 208,000
Amortization of deferred financing |  |  |  | 470,000 | 26,000
Amortization of debt discount |  |  |  | 9,241,000 | 248,000
Total interest expense |  |  |  | $ 17,239,000 | $ 482,000
Effective interest rate of the liability component |  |  | 10.85% | 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 | D | 30 |  |  |  |
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 |  |  |  |  |
Threshold trading days | 5 days |  |  |  |
Threshold consecutive trading days | D | 5 |  |  |  |
Maximum threshold percentage | 98.00% |  |  |  |
Over-allotment Option | Private Placement Purchase Agreement | Convertible Notes | 2016 Convertible Notes |  |  |  |  |
Convertible Debt |  |  |  |  |
Aggregate principal amount |  |  | $ 25,000,000 |  | $ 25,000,000

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