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Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) day | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2019 USD ($) shares | Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) shares | Sep. 30, 2018 USD ($)
Convertible Debt |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ (257,000) | $ (7,276,000) | $ 0 |
Proceeds from long-term debt, net of issuance costs |  |  |  |  |  | $ 0 | $ 385,929,000 | 0 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Equity component of the convertible notes |  |  |  |  |  | $ 2,661,000 |  | 215,476,000 |
Loss on exchange of convertible notes |  |  |  |  |  | 0 | $ 0 | 40,624,000 |
Proceeds from termination of capped call confirmations |  |  |  |  |  | $ 0 | $ 0 | $ 19,875,000 |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Equity component of the convertible notes |  |  | $ 2,656,000 | $ 215,036,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Equity component of the convertible notes |  |  | $ 5,000 | $ 440,000 |  |  |  |  |
Equity component of the convertible notes (in shares) | shares |  |  | 472,356 | 44,000,000 |  |  |  | 43,995,139 |
Convertible Notes |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Exchange agreement, aggregate principal amount |  |  |  |  | $ 247,200,000 |  |  |  |
Exchange agreement, authorized (in shares) | shares |  |  |  |  | 44,000,000 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  |  |  |
Accrued and unpaid interest on exchange agreement |  |  |  |  | $ 1,300,000 |  |  |  |
Gain (loss) on extinguishment of debt, fair value of common shares issued |  |  |  |  |  |  |  | $ 400,000 |
Loss on exchange of convertible notes |  |  |  |  |  |  |  | 40,600,000 |
Proceeds from termination of capped call confirmations |  |  |  |  | $ 19,900,000 |  |  |  |
Convertible Notes | Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Equity component of the convertible notes |  |  |  |  |  |  |  | $ 215,000,000 |
Convertible Notes | 2016 Convertible Notes |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 250,000,000 |  |  |  |  |  |  |
Proceeds from long-term debt, net of issuance costs |  | 243,000,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Debt conversion, converted instrument, amount |  |  | $ 2,800,000 | $ 247,200,000 |  |  |  |  |
Convertible Notes | 2016 Convertible Notes | Private Placement Purchase Agreement | Over-allotment Option |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 25,000,000 |  |  |  |  |  |  |
Secured Debt | Senior Secured Term Loan due 2026: |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Interest expense, debt | $ 1,100,000 |  |  |  |  |  |  |  |
Early settlement premiums | 5,200,000 |  |  |  |  |  |  |  |
Loss on extinguishment of debt | (7,300,000) |  |  |  |  |  |  |  |
Secured Debt | Senior Loans |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Minimum liquidity covenant | 75,000,000 |  |  |  |  |  |  |  |
Secured Debt | Senior Loans | Minimum |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Consolidated revenue covenant, amount | 140,000,000 |  |  |  |  |  |  |  |
Secured Debt | Senior Loans | Maximum |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Consolidated revenue covenant, amount | $ 225,000,000 |  |  |  |  |  |  |  |
Secured Debt | Senior Loans | LIBOR |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Variable rate | 1.00% |  |  |  |  |  |  |  |
Basis spread on variable rate | 6.50% |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 150,000,000

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