CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Cash flows from operating activities:
Net loss	$ (5,952,000)	$ (7,275,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	12,356,000	15,296,000
Amortization of debt issuance costs and discount	507,000	933,000
(Gain) loss on sale or maturity of marketable securities	(1,000)	170,000
Loss (gain) on forward contracts	99,000	(78,000)
Stock-based compensation expense	4,800,000	3,843,000
Gain on disposal of fixed assets	(58,000)	0
Impairment of cost-method investment	0	339,000
Changes in assets and liabilities:
Accounts receivable, net	(8,867,000)	33,563,000
Inventories	2,356,000	1,393,000
Prepaid expenses and other assets	(3,253,000)	1,137,000
Accounts payable and accrued expenses (includes restructuring)	1,567,000	(35,029,000)
Accrued payroll obligations	(1,441,000)	(1,706,000)
Income taxes payable	413,000	(1,765,000)
Deferred income and allowances on sales to distributors	0	(2,720,000)
Deferred licensing and services revenue	(68,000)	(436,000)
Net cash provided by operating activities	2,458,000	7,665,000
Cash flows from investing activities:
Proceeds from sales of and maturities of short-term marketable securities	2,500,000	5,700,000
Purchases of marketable securities	(9,603,000)	(7,420,000)
Capital expenditures	(1,804,000)	(3,374,000)
Cash paid for software licenses	(1,837,000)	(1,617,000)
Net cash used in investing activities	(10,744,000)	(6,711,000)
Cash flows from financing activities:
Restricted stock unit withholdings	(459,000)	(693,000)
Proceeds from issuance of common stock	1,608,000	1,144,000
Repayment of debt	(875,000)	(10,780,000)
Net cash provided by (used in) financing activities	274,000	(10,329,000)
Effect of exchange rate change on cash	589,000	274,000
Net increase in cash and cash equivalents	(7,423,000)	(9,101,000)
Beginning cash and cash equivalents	106,815,000	106,552,000
Ending cash and cash equivalents	99,392,000	97,451,000
Supplemental cash flow information:
Change in unrealized gain (loss) related to marketable securities, net of tax, included in Accumulated other comprehensive loss	7,000	43,000
Income taxes paid, net of refunds	40,000	222,000
Interest paid	4,420,000	5,025,000
Accrued purchases of plant and equipment	$ 232,000	$ 1,297,000