CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance (in shares) at Dec. 31, 2020				98,204
Beginning balance at Dec. 31, 2020	$ 258,302			$ 98		$ 2,353,559			$ (2,101,211)			$ 5,856
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(6,124)								(6,124)
Other comprehensive loss, net of tax	(3,981)											(3,981)
Issuance of common stock under stock option, award and purchase plans (in shares)				2,789
Issuance of common stock under stock option, award and purchase plans	4,775			$ 3		4,772
Stock-based compensation	8,362					8,362
Reclassification from equity to mezzanine equity for 2020 Notes	(1,564)					(1,564)
Ending balance (in shares) at Apr. 02, 2021				100,993
Ending balance at Apr. 02, 2021	259,770			$ 101		2,365,129			(2,107,335)			1,875
Beginning balance (in shares) at Dec. 31, 2020				98,204
Beginning balance at Dec. 31, 2020	$ 258,302			$ 98		2,353,559			(2,101,211)			5,856
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	ASU 2020-06
Ending balance (in shares) at Dec. 31, 2021				102,959	102,959
Ending balance at Dec. 31, 2021	$ 295,913	$ (13,910)	$ 282,003	$ 103	$ 103	2,387,039	$ (32,249)	$ 2,354,790	(2,087,957)	$ 18,339	$ (2,069,618)	(3,272)	$ (3,272)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,529)								(1,529)
Other comprehensive loss, net of tax	(1,765)											(1,765)
Issuance of common stock under stock option, award and purchase plans (in shares)				1,877
Issuance of common stock under stock option, award and purchase plans	274			$ 2		272
Repurchase of common stock (in shares)				(233)
Repurchase of common stock	(2,141)			$ (2,100)
Stock-based compensation	7,811					7,811
Ending balance (in shares) at Apr. 01, 2022				104,603
Ending balance at Apr. 01, 2022	$ 284,653			$ 105		$ 2,362,873			$ (2,073,288)			$ (5,037)