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Debt Obligations - Convertible Notes due 2022 Narrative (Details) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 07, 2019 USD ($) | Feb. 29, 2016 USD ($) item $ / shares shares | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 30, 2022 $ / shares | Apr. 14, 2020 $ / shares | Jan. 01, 2020
Debt Instrument |  |  |  |  |  |  |  |  |
Proceeds from issuance of 2026 Convertible Notes, net of issuance costs |  |  |  |  |  | $ 222,156,000 |  |  |
Outstanding amount payoff |  |  |  | $ 109,000,000 |  |  |  |  |
Convertible trading days | item |  | 15 |  |  |  |  |  |  |
Closing stock, price per share | $ / shares |  |  |  |  |  |  | $ 7.92 | $ 14.82 |
8.2% Convertible Notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate description |  | The 2022 Convertible Notes bore interest at a fixed coupon rate of 8.2% per annum payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year, since March 31, 2016 |  |  |  |  |  |  |
Convertible notes, premium percentage |  | 9.00% |  |  |  |  |  |  |
2025 Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  | 0 |  |  |  |  |
Interest rate description | Starting January 1, 2020, the Borrowings under the 2025 Term Loan bore interest at 6.75% per annum plus three month LIBOR. Interest was payable quarterly in arrears. Under the prospective method to account for future cash payments adopted by the Company, the effective interest rate was not constant, and any change in the expected cash flows was recognized prospectively as an adjustment to the effective yield. |  |  |  |  |  |  |  |
2025 Term Loan | Lender |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Principal amount | $ 75,000,000.0 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 6.75%
Interest expense |  |  |  | 170,000 | $ 8,066,000 | 7,871,000 |  |  |
Debt Instrument Term | 6 years |  |  |  |  |  |  |  |
Convertible Notes | KKR Member |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Principal amount |  | $ 20,000,000.0 |  |  |  |  |  |  |
Convertible Notes | MX II Member |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Principal amount |  | 4,000,000.0 |  |  |  |  |  |  |
Convertible Notes | KMGCP Member |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Principal amount |  | 1,000,000.0 |  |  |  |  |  |  |
Convertible Notes | Lender | KKR Member |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Principal amount |  | 75,000,000.0 |  |  |  |  |  |  |
Convertible Notes | 8.2% Convertible Notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Principal amount |  | $ 100,000,000.0 |  |  |  |  |  |  |
Stated interest rate |  | 8.20% |  |  |  |  |  |  |
Proceeds from issuance of 2026 Convertible Notes, net of issuance costs |  | $ 99,200,000 |  |  |  |  |  |  |
Convertible notes, Issuance Cost |  | $ 800,000 |  |  |  |  |  |  |
Interest expense |  |  |  | $ 2,571,000 | $ 10,166,000 | $ 9,991,000 |  |  |
Debt instrument maturity date |  | Mar. 31, 2022 |  |  |  |  |  |  |
Outstanding amount payoff |  |  | $ 111,100,000 |  |  |  |  |  |
Convertible Notes Payable |  |  | $ 0 |  |  |  |  |  |
Convertible notes, premium percentage |  | 9.00% | 9.00% |  |  |  |  |  |
Initial conversion rate, shares of common stock | shares |  | 44.7387 |  |  |  |  |  |  |
Principal amount of notes converted into shares |  | $ 1,000 |  |  |  |  |  |  |
Initial conversion price per common share | $ / shares |  | $ 22.35 |  |  |  |  |  |  |
Initial conversion price, percentage premium over average last reported sale price of common stock |  | 60 |  |  |  |  |  |  |
Percentage of applicable conversion price, threshold |  | 160.00% |  |  |  |  |  |  |
Consecutive trading days | item |  | 30 |  |  |  |  |  |  |
Percentage to pay in cash of the par value of notes |  | 109.00% |  |  |  |  |  |  |
Convertible Notes | 8.2% Convertible Notes due 2022 | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Convertible trading days | item |  | 20 |  |  |  |  |  |  |

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