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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt is summarized as follows:
December 31, 2020December 31, 2019
Principal amount of 4.50% exchangeable senior notes due 2023
$143,750 $143,750 
Less: unamortized debt discount and issuance costs, net (15,540)(22,064)
Net carrying amount of liability component128,210 121,686 
Less: current maturities— — 
     Long-term debt$128,210 $121,686 
Equity component:
Equity component of exchangeable notes, net of issuance costs$(26,699)$(26,699)