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v3.19.1

Debt - Convertible Debt (Details) |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 16, 2018 shares | Feb. 15, 2018 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) day $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares
Convertible Debt |  |  |  |  |  |  |
Derivative liability, noncurrent |  | $ 507,400,000 |  |  |  |  |
Change in fair value of derivatives |  |  |  |  | $ 0 | $ 4,861,000 |
Derivative liabilities |  |  |  |  | 80,600,000 |  |
Capped call confirmation, current |  |  |  |  | 2,200,000 |  |
Exchange agreement, aggregate principal amount |  |  |  |  | $ 219,300,000 |  |
Shares authorized for issuance (in shares) | shares |  |  |  |  | 39,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01
Exchange agreement, accrued and unpaid interest |  |  |  |  | $ 1,000,000 |  |
Loss on exchange of convertible debt |  |  |  |  | 36,123,000 | 0 |
Gain (loss) on extinguishment of debt, additional paid-in capital |  |  |  |  | (190,400,000) |  |
Gain (loss) on extinguishment of debt, fair value of common shares issued |  |  |  |  | (400,000) |  |
Proceeds from capped call confirmations, exchange of convertible debt |  |  |  |  | $ 14,632,000 | 0 |
Common Stock Capped Call Confirmation |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Derivative asset, noncurrent |  | $ 13,600,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Common stock issued from underwriting agreement (in shares) | shares | 885,000 | 19,354,839 |  |  |  |  |
Over-allotment Option | Common Stock |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Number of days granted underwriters for purchase of shares |  | 30 days |  |  |  |  |
Maximum number of additional shares granted to underwriters | shares | 2,903,225 |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Threshold percentage |  |  |  |  | 130.00% |  |
Convertible Notes | Convertible Senior Notes 2016, Due 2023 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 250,000,000 |  |  |
Net proceeds after deducting fees and estimated expenses |  |  |  | 243,000,000 |  |  |
Proceeds for capped call confirmations |  |  |  | $ 13,500,000 |  |  |
Shares issued per increment of convertible debt | shares |  |  |  | 40,849,675 |  |  |
Debt conversion ratio (in shares) |  |  |  | 0.1633987 |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 6.12 |  |  |
Threshold consecutive trading days | day |  |  |  | 30 |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Principal |  |  |  |  | $ 180,702,000 |  | $ 400,000,000
Less: debt discount |  |  |  |  | (11,076,000) |  | (74,145,000)
Less: deferred financing |  |  |  |  | (808,000) |  | (4,115,000)
Net carrying value of the debt |  |  |  |  | (168,818,000) |  | $ (321,740,000)
Interest expense |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | 4,813,000 | 1,887,000 |
Amortization of debt discount |  |  |  |  | 1,559,000 | 2,472,000 |
Amortization of deferred financing |  |  |  |  | 83,000 | 129,000 |
Total |  |  |  |  | $ 6,455,000 | $ 4,488,000 |
Convertible Notes | Convertible Senior Notes 2016, Due 2023 | Minimum |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Threshold trading days |  |  |  | 20 days |  |  |
Convertible Notes | Convertible Senior Notes 2016, Due 2023 | Over-allotment Option | Private Placement Purchase Agreement |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 25,000,000 |  |  |
Line of Credit |  |  |  |  |  |  |
Debt Instruments |  |  |  |  |  |  |
New credit facility borrowing capacity |  |  | $ 150,000,000 |  |  |  |
Debt instrument term |  |  | 5 years |  |  |  |
Periodic payment, percentage |  |  | 12.50% |  |  |  |
Proceeds from issuance of debt |  |  | $ 146,600,000 |  |  |  |
Line of Credit | LIBOR |  |  |  |  |  |  |
Debt Instruments |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 7.50% |  |  |  |

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