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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Debt
Long-term debt is summarized as follows:
June 30, 2021December 31, 2020
Principal amount of 4.50% exchangeable senior notes due 2023
$143,750 $143,750 
Less: unamortized debt discount and issuance costs, net (1,976)(15,540)
Net carrying amount of liability component141,774 128,210 
Less: current maturities— — 
     Long-term debt$141,774 $128,210 
Equity component:
Equity component of exchangeable notes, net of issuance costs$— $(26,699)