CONVERTIBLE DEBT (Tables)

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The following table presents the components of the 2022 Notes:

	As of
(in thousands, except for years and percentages)	September 30, 2022		December 31, 2021
Liability component:
Principal amount	$	37,707	$	37,707
Less: Debt discount, net of amortization	—		(672)
Less: Debt issuance costs, net of amortization	(50)		(211)
Carrying amount	$	37,657	$	36,824
Remaining debt discount amortization period (years)	n/a		0.9
Effective interest rate on liability component	n/a		6.95		%

The following table presents the components of the 2024 Notes:

	As of
(in thousands, except for years and percentages)	September 30, 2022		December 31, 2021
Liability component:
Principal amount	$	115,500	$	115,500
Less: Debt discount, net of amortization	—		(14,576)
Less: Debt issuance costs, net of amortization	(1,739)		(1,983)
Carrying amount	$	113,761	$	98,941
Remaining debt discount amortization period (years)	n/a		2.7
Effective interest rate on liability component	n/a		7.95		%

Schedule of Convertible Debt Interest

The following table presents interest expense recognized for the 2022 Notes:

	Three Months Ended				Nine Months Ended
(in thousands)	September 30, 2022		October 1, 2021		September 30, 2022		October 1, 2021
Contractual interest expense	$	412	$	412	$	1,236	$	1,236
Amortization of debt discount	—		171		—		508
Amortization of debt issuance costs	69		54		207		159
Total interest expense recognized	$	481	$	637	$	1,443	$	1,903

The following table presents interest expense recognized for the 2024 Notes:

	Three Months Ended				Nine Months Ended
(in thousands)	September 30, 2022		October 1, 2021		September 30, 2022		October 1, 2021
Contractual interest expense	$	578	$	578	$	1,734	$	1,734
Amortization of debt discount	—		1,193		—		3,505
Amortization of debt issuance costs	220		162		654		476
Total interest expense recognized	$	798	$	1,933	$	2,388	$	5,715