CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Cash flows from operating activities:
Net loss	$ (26,175,000)	$ (20,297,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	22,425,000	30,497,000
Impairment of acquired intangible assets	11,900,000	0
Amortization of debt issuance costs and discount	1,058,000	1,354,000
(Gain) loss on sale or maturity of marketable securities	(1,000)	200,000
Gain on forward contracts	(36,000)	(26,000)
Stock-based compensation expense	7,200,000	6,772,000
Gain on disposal of fixed assets	(93,000)	(61,000)
Gain on sale of assets and business units	0	(300,000)
Impairment of cost-method investment	0	493,000
Changes in assets and liabilities:
Accounts receivable, net	(19,654,000)	12,846,000
Inventories	14,687,000	689,000
Prepaid expenses and other assets	(7,891,000)	2,822,000
Accounts payable and accrued expenses (includes restructuring)	7,095,000	(13,554,000)
Accrued payroll obligations	(1,716,000)	(1,894,000)
Income taxes payable	851,000	(355,000)
Deferred income and allowances on sales to distributors	0	(7,342,000)
Deferred licensing and services revenue	(68,000)	(330,000)
Net cash provided by operating activities	9,582,000	11,514,000
Cash flows from investing activities:
Proceeds from sales of and maturities of short-term marketable securities	2,500,000	7,200,000
Purchases of marketable securities	(9,603,000)	(7,420,000)
Capital expenditures	(4,105,000)	(7,035,000)
Proceeds from sale of assets and business units	0	300,000
Short-term loan to cost-method investee	0	(1,000,000)
Cash paid for software licenses	(3,981,000)	(4,149,000)
Net cash used in investing activities	(15,189,000)	(12,104,000)
Cash flows from financing activities:
Restricted stock unit tax withholdings	(1,369,000)	(1,748,000)
Proceeds from issuance of common stock	6,409,000	2,931,000
Repayment of debt	(12,009,000)	(33,679,000)
Net cash used in financing activities	(6,969,000)	(32,496,000)
Effect of exchange rate change on cash	(540,000)	950,000
Net increase in cash and cash equivalents	(13,116,000)	(32,136,000)
Beginning cash and cash equivalents	106,815,000	106,552,000
Ending cash and cash equivalents	93,699,000	74,416,000
Supplemental cash flow information:
Change in unrealized gain (loss) related to marketable securities, net of tax, included in Accumulated other comprehensive loss	(2,000)	71,000
Income taxes paid, net of refunds	2,057,000	976,000
Interest paid	9,177,000	12,094,000
Accrued purchases of plant and equipment	$ 354,000	$ 2,216,000