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Long-Term Debt - Convertible Senior Notes Due 2026 (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Interest expense | $ 6,097,000 | $ 8,007,000 | $ 18,152,000 | $ 22,580,000 |
Amortization of debt issuance costs |  |  | $ 2,596,000 | 2,401,000 |
Convertible Senior Notes Maturing February 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 6.75% |  | 6.75% |  |
Maturity date |  |  | Feb. 15, 2026 |  |
Frequency of periodic payment |  |  | semi-annually |  |
Initial conversion ratio |  |  | 0.1433795 |  |
Aggregate number of shares | shares |  |  | 28,675,900 |  |
Initial conversion price per share (USD per share) | $ / shares | $ 6.97 |  | $ 6.97 |  |
Increase in the conversion rate |  |  | 0.0645207 |  |
Redemption price as a percentage of principal amount |  |  | 100.00% |  |
Unamortized debt discount and debt issuance costs |  |  |  |  | $ 47,300,000
Unamortized debt issuance costs | $ 6,200,000 |  | $ 6,200,000 |  |
Effective interest rate (as a percent) | 7.60% |  | 7.60% |  | 12.40%
Interest expense | $ 3,700,000 | 2,500,000 | $ 11,000,000.0 | 2,500,000 |
Coupon interest expense | 3,400,000 | 1,700,000 | 10,100,000 | 1,700,000 |
Amortization of debt issuance costs | $ 300,000 | $ 800,000 | $ 900,000 | $ 800,000 |
Convertible Senior Notes Maturing February 2026 | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of closing price of common stock to conversion price |  |  | 130.00% |  |
Number of trading days |  |  | 20 |  |
Number of consecutive trading days |  |  | 30 |  |
Convertible Senior Notes Maturing February 2026 | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of closing price of common stock to conversion price |  |  | 97.00% |  |
Number of trading days |  |  | 5 |  |
Number of consecutive trading days |  |  | 10 |  |

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