DEBT (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Summary of debt
The following table reflects the Company’s debt as of December 31, 2021 and 2020 (in thousands):
December 31, 2021December 31, 2020
13% Senior Secured Note due 2024
$70,750 $80,250 
Royalty rights obligation2,743 3,533 
2.50% Convertible Notes due 2021
— 335 
Total principal amount73,493 84,118 
Unamortized debt discounts— (16)
Carrying value73,493 84,102 
Less: current portion of long-term debt(12,174)(11,942)
Net, long-term debt$61,319 $72,160 
Summary of interest expense The following table reflects debt related interest included in the Interest expense in the Company’s Consolidated Statements of Comprehensive Income as of December 31, 2021 and 2020 (in thousands):
Year ended December 31,
20212020
Interest payable on Convertible Notes$6 $1,727 
Interest payable on 13% Senior Secured Notes due 2024
10,020 6,870 
Interest payable on Senior Notes— 1,648 
Amortization of debt discounts, and royalty rights194 5,680 
Total interest expense$10,220 $15,925