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v3.19.3

Debt (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 16, 2018 shares | Feb. 15, 2018 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) day $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 shares | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Jun. 07, 2018 USD ($) shares
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued from underwriting agreement (in shares) | shares |  |  |  |  |  | 18,700,000 |  |  |  |  |  |
Derivative liability, noncurrent |  | $ 507,400,000 |  |  |  |  |  |  |  |  |  |
Change in fair value of derivatives |  |  |  |  |  |  |  |  |  | $ (2,700,000) |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  | 500,000,000 |  |  |  | 500,000,000 |  | 500,000,000 | 500,000,000
Derivative liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 88,300,000
Other assets, current |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000
Exchange agreement, aggregate principal amount |  |  |  |  | $ 247,200,000 |  |  |  | $ 247,200,000 |  |  |
Shares authorized for issuance (in shares) | shares |  |  |  |  | 44,000,000.0 |  |  |  | 44,000,000.0 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |
Exchange agreement, accrued and unpaid interest |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  |
Gain (loss) on extinguishment of debt, additional paid-in capital |  |  |  |  | $ 215,000,000.0 |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt, fair value of common shares issued |  |  |  |  | 400,000 |  |  |  |  |  |  |
Gain (loss) on exchange of convertible debt |  |  |  |  | 0 |  | $ 0 |  | 40,624,000 | 0 |  |
Proceeds from capped call confirmations, exchange of convertible debt |  |  |  |  |  |  |  | $ 19,900,000 | $ 19,875,000 | 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 | 19,400,000 |  |  |  |  |  |  |  |  |  |
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 (in shares) | shares | 2,900,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 243,000,000.0 |  |  |  |  |  |  |  |
Proceeds for capped call confirmations |  |  |  | $ 13,500,000 |  |  |  |  |  |  |  |
Shares issued per increment of convertible debt (in shares) | shares |  |  |  | 40,800,000 |  |  |  |  |  |  |  |
Debt conversion ratio (in shares) |  |  |  | 0.1633987 |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 6.12 |  |  |  |  |  |  |  |
Threshold trading days |  |  |  | 20 days |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  |  |  | 30 |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | 152,825,000 |  |  |  | $ 152,825,000 |  | $ 400,000,000 |
Less: debt discount |  |  |  |  | (3,192,000) |  |  |  | (3,192,000) |  | (74,145,000) |
Less: deferred financing |  |  |  |  | (373,000) |  |  |  | (373,000) |  | (4,115,000) |
Net carrying value of the debt |  |  |  |  | (149,260,000) |  |  |  | (149,260,000) |  | $ (321,740,000) |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | 3,820,000 |  | 1,969,000 |  | 12,779,000 | 5,744,000 |  |
Amortization of debt discount |  |  |  |  | 182,000 |  | 2,609,000 |  | 2,164,000 | 7,620,000 |  |
Amortization of deferred financing |  |  |  |  | 23,000 |  | 137,000 |  | 145,000 | 399,000 |  |
Total |  |  |  |  | $ 4,025,000 |  | 4,715,000 |  | $ 15,088,000 | 13,763,000 |  |
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 |  |  |  | $ 150,000,000 |  |  | $ 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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