CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Cash flows from operating activities:
Net income (loss)	$ 29,506	$ (19,201)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	24,682	30,740
Impairment of acquired intangible assets	0	12,486
Stock-based compensation expense	13,335	9,908
Amortization of operating lease right-of-use assets	4,372	0
Loss on re-financing of long-term debt	2,235	0
Amortization of debt issuance costs and discount	1,539	1,847
Impairment of operating lease right-of-use asset (recorded in Restructuring charges)	977	0
Other non-cash adjustments	(63)	8
Changes in assets and liabilities:
Accounts receivable, net	13,457	(18,736)
Inventories	7,424	13,892
Prepaid expenses and other assets	(8,741)	(11,729)
Accounts payable and accrued expenses (includes restructuring)	(196)	1,661
Accrued payroll obligations	2,063	(557)
Operating lease liabilities, current and long-term portions	(5,571)	0
Income taxes payable	(202)	309
Deferred licensing and services revenue	0	(68)
Net cash provided by operating activities	84,817	20,560
Cash flows from investing activities:
Proceeds from sales of and maturities of short-term marketable securities	9,655	5,000
Purchases of marketable securities	0	(9,603)
Capital expenditures	(11,729)	(6,178)
Cash paid for software licenses	(5,745)	(6,144)
Net cash used in investing activities	(7,819)	(16,925)
Cash flows from financing activities:
Restricted stock unit tax withholdings	(7,813)	(1,600)
Proceeds from issuance of common stock	16,178	28,051
Proceeds from issuance of long-term debt	206,500	0
Original issue discount and debt issuance costs	(2,086)	0
Repayment of debt	(311,408)	(27,884)
Net cash used in financing activities	(98,629)	(1,433)
Effect of exchange rate change on cash	(7)	(1,124)
Net (decrease) increase in cash and cash equivalents	(21,638)	1,078
Beginning cash and cash equivalents	119,051	106,815
Ending cash and cash equivalents	97,413	107,893
Supplemental disclosure of cash flow information and non-cash investing and financing activities:
Interest paid	9,932	13,976
Operating lease payments	6,540	0
Income taxes paid, net of refunds	1,922	2,716
Accrued purchases of plant and equipment	1,841	332
Operating lease right-of-use assets obtained in exchange for lease obligations	404	0
Change in unrealized gain related to marketable securities, net of tax, included in Accumulated other comprehensive loss	$ 42	$ 16