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Stockholders' Equity - Common Stock and Warrants (Details) |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 18, 2017 USD ($) | Jul. 12, 2017 USD ($) $ / shares shares | Dec. 21, 2016 USD ($) $ / shares | Sep. 30, 2017 USD ($) item shares | Sep. 30, 2016 USD ($) | Dec. 31, 2016 shares
Convertible Debt |  |  |  |  |  |
Authorized number of shares of common stock | shares |  |  |  | 250,000,000 |  | 250,000,000
Voting right for each share held, number | item |  |  |  | 1 |  |
Net proceeds from the issuance of common stock |  |  |  | $ 243,036,000 | $ 97,068,000 |
Common Stock |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |
Number of common stock issued from underwriting agreement | shares |  | 21,122,449 |  |  |  |
Price per share of common stock issued (in dollars per share) | $ / shares |  | $ 12.25 |  |  |  |
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions |  | $ 258,800,000 |  |  |  |
Net proceeds from the issuance of common stock | $ 243,000,000 |  |  | $ 243,000,000 |  |
2016 Convertible Notes | Convertible Notes |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |
Aggregate principle amount |  |  | $ 250,000,000 |  |  |
Debt conversion ratio (in shares) |  |  | 0.1633987 |  |  |
Increment used for debt conversion |  |  | $ 1,000 |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 6.12 |  |  |
2016 Convertible Notes | Convertible Notes | Common Stock |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |
Debt conversion ratio (in shares) |  |  | 0.1633987 |  |  |
Increment used for debt conversion |  |  | $ 1,000 |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 6.12 |  |  |

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