Debt (Tables)

12 Months Ended

Dec. 31, 2021

Convertible Senior Secured Notes due 2024

Summary of Outstanding Note Balances

The outstanding 2024 Note balances as of December 31, 2021 and December 31, 2020 consisted of the following:

(In thousands)	December 31, 2021			December 31, 2020
Liability component:
Principal	$	207,000		$	207,000
Less: debt discount and debt issuance costs, net		(55,975	)		(69,381	)
Net carrying amount		151,025			137,619
Equity component		18,257		$	18,257
Derivative liability-conversion Option	$	37		$	1,193

Schedule of Interest Expense Recognized Related to the Notes

The following table sets forth total interest expense recognized related to the 2024 Notes for the years ended December 31, 2021 and 2020:

(In thousands)	Year ended December 31, 2021		Year ended December 31,  2020
Contractual interest expense	$	12,420	$	12,420
Amortization of debt issuance costs		952		798
Amortization of debt discount		12,454		10,430
Total interest expense	$	25,826	$	23,648

Convertible Senior Notes due 2021

Summary of Outstanding Note Balances

The outstanding 2021 Note balances as of December 31, 2021 and 2020 consisted of the following:

(In thousands)	December 31, 2021		December 31, 2020
Liability component:
Principal	$	—	$	69,000
Less: debt discount and debt issuance costs , net		—		(1,029	)
Net carrying amount		—	$	67,971
Equity component	$	—	$	22,791

Schedule of Interest Expense Recognized Related to the Notes

The following table sets forth total interest expense recognized related to the 2021 Notes for the years ended December 31, 2021 and 2020:

(In thousands)	Year ended December 31,         2021		Year ended December 31,         2020
Contractual interest expense	$	428	$	1,208
Amortization of debt issuance costs		95		201
Amortization of debt discount		934		1,968
Total interest expense	$	1,457	$	3,377