CONVERTIBLE DEBT (Tables)

3 Months Ended

Apr. 01, 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)	April 1, 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	(189)		(211)
Carrying amount	$	37,518	$	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)	April 1, 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	(2,176)		(1,983)
Carrying amount	$	113,324	$	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
(in thousands)	April 1, 2022		April 2, 2021
Contractual interest expense	$	412	$	412
Amortization of debt discount	—		166
Amortization of debt issuance costs	68		52
Total interest expense recognized	$	480	$	630

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

	Three Months Ended
(in thousands)	April 1, 2022		April 2, 2021
Contractual interest expense	$	578	$	578
Amortization of debt discount	—		1,146
Amortization of debt issuance costs	217		156
Total interest expense recognized	$	795	$	1,880