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Debt - Narrative (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) day | Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) day $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) day $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Jun. 30, 2018 $ / shares
Convertible Debt |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 7,276,000 | $ 0 | $ 0 |
Proceeds from long-term debt, net of issuance costs |  |  |  |  | $ 385,929,000 | $ 0 | 146,596,000 |
Exchange agreement, aggregate principal amount |  |  |  | $ 247,200,000 |  |  |  |
Exchange agreement, authorized (in shares) | shares |  |  |  | 44,000,000.0 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01
Accrued and unpaid interest on exchange agreement |  |  |  | $ 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 |  |
Loss on exchange of convertible notes |  |  |  |  | $ 0 | 40,624,000 | 0 |
Proceeds from capped call confirmations, exchange of convertible debt |  |  |  | $ 19,900,000 | $ 0 | $ (19,875,000) | $ 0 |
2016 Convertible Notes | Convertible Notes |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 250,000,000 |  |  |  |  |
Proceeds from long-term debt, net of issuance costs |  |  | 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 |  | 30 |  |  |
Threshold percentage |  |  | 130.00% |  | 130.00% |  |  |
Period following 5 consecutive trading day period, trading price less than 98% of product of sales price |  |  | 5 years |  |  |  |  |
Period following issuance of stock rights options or warrants with price per share less than last reported sales price |  |  | 60 days |  |  |  |  |
Period for measurement of sales price |  |  | 10 days |  |  |  |  |
Excess of value per share for triggering event, percent |  |  | 10.00% |  |  |  |  |
2016 Convertible Notes | Convertible Notes | Private Placement Purchase Agreement | Over-allotment Option |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 25,000,000 |  |  |  |  |
2016 Convertible Notes | Convertible Notes | Minimum |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Threshold trading days |  |  | 20 days |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026 |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 400,000,000 |  |  |  |  |  |  |
Number of payments | day | 9 |  |  |  |  |  |  |
Periodic payment | $ 44,400,000 |  |  |  |  |  |  |
Proceeds from secured lines of credit | 385,900,000 |  |  |  |  |  |  |
Early repayment of senior debt | 156,300,000 |  |  |  |  |  |  |
Interest expense, debt | 1,100,000 |  |  |  |  |  |  |
Early settlement premiums | 5,200,000 |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 7,300,000 |  |  |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026 | LIBOR |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Variable rate | 1.00% |  |  |  |  |  |  |
Basis spread on variable rate | 6.50% |  |  |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 400,000,000 |  |  |  |  |  |  |
Proceeds from secured lines of credit | 385,900,000 |  |  |  |  |  |  |
Minimum liquidity covenant | $ 75,000,000 |  |  |  |  |  |  |
Debt instrument term | 6 years |  |  |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans | Minimum |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Consolidated revenue covenant, amount | $ 140,000,000 |  |  |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans | Maximum |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Consolidated revenue covenant, amount | $ 225,000,000 |  |  |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans | LIBOR | Minimum |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Variable rate | 1.00% |  |  |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans | LIBOR | Maximum |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Basis spread on variable rate | 6.50% |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Maximum 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 |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 7.50% |  |  |  |  |  |

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