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Debt (Details) - Convertible Debt - 3.25% Convertible Senior Notes Due 2023 [Member] - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt (Details) - Convertible Debt [Line Items]    
Principal/ Fair Value Amount [1] $ 0 $ 34,134
Debt Issuance Costs [1] 0 0
Net Amount [1] $ 0 $ 34,134
[1] 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.