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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Interest Expense, Debt
The following table details the interest expense related to the Convertible Senior Notes:
Year Ended December 31,
(in thousands)20212020
Cash coupon$16,475 $16,475 
Amortization of issuance costs1,692 1,617 
Total interest expense$18,167 $18,092 
Schedule of Long-term Debt Instruments
The following table details the carrying value of the Convertible Senior Notes:
December 2022 Convertible Senior Notes
Year Ended December 31,
(in thousands)20212020
Principal outstanding$143,750 $143,750 
Less: Unamortized issuance costs(875)(1,774)
Net carrying value$142,875 $141,976 

October 2023 Convertible Senior Notes
Year Ended December 31,
(in thousands)20212020
Principal outstanding$131,600 $131,600 
Less: Unamortized issuance costs(1,533)(2,326)
Net carrying value$130,067 $129,274 
The table below summarizes the net carrying amount of the senior secured term loan facilities:
Year Ended December 31,
(in thousands)20212020
Principal outstanding$150,000 $225,000 
Less: Unamortized debt discount and issuance costs(10,120)(18,552)
Net carrying value$139,880 $206,448