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Debt (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Convertible Debt [Table Text Block] | Convertible senior notes consist of the following (in thousands):
|  | December 31, 2021 |  |  | December 31, 2020 |
|  | Principal/ |  |  | Debt |  |  |  |  |  |  | Principal/ |  |  | Debt |  |  |  |  |
|  | Fair Value |  |  | Issuance |  |  | Net |  |  | Fair Value |  |  | Issuance |  |  | Net |
|  | Amount |  |  | Costs |  |  | Amount |  |  | Amount |  |  | Costs |  |  | Amount |
3.25% convertible senior notes due 2023 * |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 34,134 |  |  | $ | — |  |  | $ | 34,134 |
*The amounts presented for the 3.25% convertible senior notes due 2023 within the table represent the fair value as of December 31, 2020 (see Note 16 - Fair Value Measurements). The principal amount of these notes is $22.9 million as of December 31, 2020. The accrued, but unpaid, payment-in-kind interest is $0.9 million as of December 31, 2020.
Schedule of Long-term Debt Instruments [Table Text Block] |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Contractual interest expense |  | $ | — |  |  | $ | 32 |  |  | $ | 3,370 |
Amortization of debt issuance costs recognized as interest expense |  |  | — |  |  |  | — |  |  |  | 460 |
|  | $ | — |  |  | $ | 32 |  |  | $ | 3,830 |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Contractual interest expense |  | $ | — |  |  | $ | — |  |  | $ | 580 |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Contractual interest expense |  | $ | 620 |  |  | $ | 2,004 |  |  | $ | 899 |
Schedule of Debt [Table Text Block] | Term loan consists of the following (in thousands):
|  | December 31, 2021 |  |  | December 31, 2020 |
|  |  |  |  |  | Debt Discount/ |  |  |  |  |  |  |  |  |  |  | Debt Discount/ |  |  |  |  |
|  | Principal |  |  | Issuance |  |  | Net |  |  | Principal |  |  | Issuance |  |  | Net |
|  | Amount |  |  | Costs* |  |  | Amount |  |  | Amount** |  |  | Costs* |  |  | Amount |
2019 Recap Term Loan |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 119,801 |  |  | $ | (8,471 | ) |  | $ | 111,330 |
2021 BSP Term Loan |  |  | 98,505 |  |  |  | (2,986 | ) |  |  | 95,519 |  |  |  | — |  |  |  | — |  |  |  | — |
* The term loan was valued using the discounted cash flow method to determine the implied debt discount. The debt discount and issuance costs are being amortized over the life of the term loan on a straight-line basis which approximates the effective interest method. ** The amount presented excludes accrued, but unpaid, PIK interest of $4.7 million as of December 31, 2020.
Schedule of Maturities of Long-term Debt [Table Text Block] | The aggregate principal amount of long-term debt maturing in the next five years and thereafter is as follows:
|  |  | 2021 BSP Term Loan |
2022 | * |  | $ | 2,104 |
2023 |  |  |  | 2,475 |
2024 |  |  |  | 2,475 |
2025 |  |  |  | 2,475 |
2026 |  |  |  | 2,475 |
Thereafter |  |  |  | 86,501 |
|  |  | $ | 98,505 |
*Represents the Company’s current portion of principal amortization payments for the 2021 BSP Term Loan.

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