CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Cash flows from operating activities:
Net loss	$ (26,322)	$ (70,562)	$ (54,099)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	39,261	57,861	61,806
Impairment of acquired intangible assets	12,486	32,431	7,866
Amortization of debt issuance costs and discount	2,230	1,982	1,350
Change in deferred income tax provision	(96)	(154)	90
(Gain) loss on sale or maturity of marketable securities	(18)	252	79
Gain on forward contracts	(53)	(77)	(184)
Stock-based compensation expense	13,646	12,543	16,213
(Gain) loss on disposal of fixed assets	(178)	(75)	597
Gain on sale of building	0	(4,624)	0
Loss (gain) on sale of assets and business units	0	1,496	(2,646)
Impairment of cost-method investment	266	1,761	1,459
Changes in assets and liabilities:
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
Accrued payroll obligations	(1,051)	726	402
Income taxes payable	498	(556)	3,216
Net cash provided by operating activities	51,458	38,514	41,734
Cash flows from investing activities:
Proceeds from sales of and maturities of short-term marketable securities	5,000	12,689	14,897
Purchase of marketable securities	(9,603)	(7,420)	(7,490)
Proceeds from sale of building	0	7,895	0
Cash paid for costs of sale of building	0	(1,004)	0
Capital expenditures	(8,384)	(12,855)	(16,717)
Proceeds from sale of assets and business units, net of cash sold	0	967	1,972
Repayment received on short-term loan to cost-method investee	0	2,000	0
Short-term loan to cost-method investee	0	(2,000)	0
Cash paid for a cost-method investment	0	0	(1,000)
Cash paid for software licenses	(8,123)	(8,532)	(9,035)
Net cash used in investing activities	(21,110)	(8,260)	(17,373)
Cash flows from financing activities:
Restricted stock unit tax withholdings	(2,370)	(3,267)	(3,565)
Proceeds from issuance of common stock	29,288	6,085	7,607
Repayment of debt	(43,759)	(35,429)	(5,154)
Net cash used in financing activities	(16,841)	(32,611)	(1,112)
Effect of exchange rate change on cash	(1,271)	2,620	(1,303)
Net increase in cash and cash equivalents	12,236	263	21,946
Beginning cash and cash equivalents	106,815	106,552	84,606
Ending cash and cash equivalents	119,051	106,815	106,552
Supplemental cash flow information:
Change in unrealized (gain) loss related to marketable securities, net of tax, included in Accumulated other comprehensive loss	(41)	73	172
Income taxes paid, net of refunds	3,054	2,387	9,359
Interest paid	18,607	20,649	18,159
Accrued purchases of property and equipment	110	588	1,028
Note receivable resulting from sale of assets and business units	0	3,050	0
Product
Changes in assets and liabilities:
Deferred revenue	0	(15,007)	14,391
Licensing and services
Changes in assets and liabilities:
Deferred revenue	$ (68)	$ (495)	$ (183)