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Stockholders' Equity - Common Stock and Warrants (Details) |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 16, 2018 $ / shares shares | Feb. 15, 2018 USD ($) $ / shares shares | Jul. 18, 2017 USD ($) $ / shares shares | Apr. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares | Feb. 28, 2019 USD ($) shares | Mar. 31, 2018 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) vote $ / shares shares | Dec. 31, 2016 USD ($) $ / shares | Jun. 07, 2018 shares
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Authorized number of shares of common stock | shares |  |  |  |  |  |  |  |  | 500,000,000 | 250,000,000 |  | 500,000,000
Voting right for each share held, number | vote |  |  |  |  |  |  |  |  |  | 1 |  |
Number of common stock shares issued from underwriting agreement | shares |  |  | 21,122,449 |  |  |  | 20,239,839 |  |  |  |  |
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 |  |  |  |  |  | $ 294,583,000 | $ 243,037,000 |  |
Gross cash proceeds from warrant exercises |  |  |  |  |  |  |  |  | $ 3,617,000 | $ 0 | $ 0 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Net proceeds from the issuance of common stock after deducting underwriting discounts and commissions |  |  | $ 243,000,000 |  |  |  | $ 294,600,000 |  | $ 294,584,000 | $ 243,037,000 | 97,068,000 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Exchange agreement, aggregate principal amount |  |  |  |  |  | $ 184,600,000 |  |  |  |  |  |
Exchange agreement, shares authorized | shares |  |  |  |  |  | 33,000,000 |  |  |  |  |  |
Accrued and unpaid interest on exchange agreement |  |  |  |  |  | $ 700,000 |  |  |  |  |  |
Convertible Notes | 2016 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 250,000,000 |  |  |  |  |  | $ 250,000,000 |
Fixed interest rate |  |  |  |  | 3.00% |  |  |  |  |  | 3.00% |
Conversion rate |  |  |  |  | 16.33987% |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 6.12 |  |  |  |  |  | $ 6.12 |
Warrants |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares issued from underwriting agreement | shares |  |  |  | 453,214 |  |  |  |  |  |  |  |
Gross cash proceeds from warrant exercises |  |  |  | $ 3,600,000 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares issued from underwriting agreement | shares | 885,000 | 19,354,839 |  |  |  |  |  |  |  |  |  |
Price per share of common stock issued (in dollars per share) | $ / shares |  | $ 15.50 |  |  |  |  |  |  |  |  |  |
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of common stock after deducting underwriting discounts and commissions |  |  |  |  |  |  |  | $ 294,600,000 |  |  |  |
Common Stock | Warrants |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  | $ 7.98 |  |  |  |  |  |  |  |
Common Stock | Over-allotment Option |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares issued from underwriting agreement | shares | 885,000 |  |  |  |  |  |  |  |  |  |  |
Price per share of common stock issued (in dollars per share) | $ / shares | $ 15.50 |  |  |  |  |  |  |  |  |  |  |
Period granted to underwriters for purchase of shares |  | 30 days |  |  |  |  |  |  |  |  |  |
Maximum number of shares granted to underwriters | shares | 2,903,225 |  |  |  |  |  |  |  |  |  |  |

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