Revenue from Contracts with Customers - Schedule of New Accounting Standard Impact on Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Consolidated Statement of Operations
Revenues	$ 95,977	$ 101,484	$ 102,715	$ 98,623	$ 95,266	$ 91,971	$ 94,137	$ 104,587	$ 398,799	$ 385,961	$ 427,054
Net loss	$ (7,121)	$ 6,974	$ (20,223)	$ (5,952)	$ (7,213)	$ (43,052)	$ (13,022)	$ (7,275)	$ (26,322)	$ (70,562)	$ (54,099)
Net loss per share, basic and diluted (in dollars per share)	$ (0.05)	$ 0.05	$ (0.16)	$ (0.05)	$ (0.06)	$ (0.35)	$ (0.11)	$ (0.06)	$ (0.21)	$ (0.58)	$ (0.45)
Consolidated Balance Sheets
Accounts receivable, net of allowance for doubtful accounts	$ 60,890				$ 55,104				$ 60,890	$ 55,104
Inventories	67,096				79,903				67,096	79,903
Prepaid expenses and other current assets	27,762				16,567				27,762	16,567
Total assets	623,687				635,961				623,687	635,961
Accounts payable and accrued expenses (includes restructuring)	51,763				54,405				51,763	54,405
Deferred income and allowances on sales to distributors	0								0
Accumulated deficit	(476,783)				(477,862)				(476,783)	(477,862)
Total liabilities and stockholders' equity	623,687				635,961				623,687	635,961
Consolidated Statement of Cash Flows
Net loss	(7,121)	$ 6,974	$ (20,223)	$ (5,952)	(7,213)	$ (43,052)	$ (13,022)	$ (7,275)	(26,322)	(70,562)	$ (54,099)
Accounts receivable, net									(3,978)	44,613	(11,419)
Inventories									13,177	(902)	(3,272)
Prepaid expenses and other assets									(11,667)	889	(2,270)
Accounts payable and accrued expenses (includes restructuring)									13,325	(23,588)	8,338
Adjustments | Accounting Standards Update 2014-09
Consolidated Statement of Operations
Net loss									$ (9,177)
Net loss per share, basic and diluted (in dollars per share)									$ (0.07)
Consolidated Balance Sheets
Accounts receivable, net of allowance for doubtful accounts	6,600								$ 6,600
Inventories	78								78
Prepaid expenses and other current assets	(9,775)								(9,775)
Total assets	(3,097)								(3,097)
Accounts payable and accrued expenses (includes restructuring)	(1,156)								(1,156)
Deferred income and allowances on sales to distributors	34,637								34,637
Accumulated deficit	(36,578)								(36,578)
Total liabilities and stockholders' equity	(3,097)								(3,097)
Consolidated Statement of Cash Flows
Net loss									(9,177)
Accounts receivable, net									(8,408)
Inventories									(448)
Prepaid expenses and other assets									2,260
Accounts payable and accrued expenses (includes restructuring)									(1,614)
Pro forma as if previous standard was in effect
Consolidated Statement of Operations
Net loss									$ (35,499)
Net loss per share, basic and diluted (in dollars per share)									$ (0.28)
Consolidated Balance Sheets
Accounts receivable, net of allowance for doubtful accounts	67,490								$ 67,490
Inventories	67,174								67,174
Prepaid expenses and other current assets	17,987								17,987
Total assets	620,590								620,590
Accounts payable and accrued expenses (includes restructuring)	50,607								50,607
Deferred income and allowances on sales to distributors	34,637								34,637
Accumulated deficit	(513,361)								(513,361)
Total liabilities and stockholders' equity	620,590								620,590
Consolidated Statement of Cash Flows
Net loss									(35,499)
Accounts receivable, net									(12,386)
Inventories									12,729
Prepaid expenses and other assets									(9,407)
Accounts payable and accrued expenses (includes restructuring)									11,711
Product
Consolidated Statement of Operations
Revenues									380,468	356,502	390,704
Cost of product revenue									179,101	164,657	179,983
Consolidated Balance Sheets
Deferred income and allowances on sales to distributors	0				17,250				0	17,250
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									0	(15,007)	14,391
Product | Adjustments | Accounting Standards Update 2014-09
Consolidated Statement of Operations
Revenues									(14,098)
Cost of product revenue									(6,399)
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									17,387
Product | Pro forma as if previous standard was in effect
Consolidated Statement of Operations
Revenues									366,370
Cost of product revenue									172,702
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									17,387
Licensing and services
Consolidated Statement of Operations
Revenues									18,331	29,459	36,350
Cost of product revenue									259	4,725	637
Consolidated Balance Sheets
Deferred income and allowances on sales to distributors	$ 0				$ 68				0	68
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									(68)	$ (495)	$ (183)
Licensing and services | Adjustments | Accounting Standards Update 2014-09
Consolidated Statement of Operations
Revenues									(1,478)
Licensing and services | Pro forma as if previous standard was in effect
Consolidated Statement of Operations
Revenues									$ 16,853