CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Cash flows from operating activities:
Net loss	$ (55,527)	$ (45,859)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of intangibles	4,144	8,322
Depreciation	7,139	7,737
Stock-based compensation	7,387	5,862
Amortization of discount on convertible debt and issuance cost	2,676	2,417
Restructuring, asset impairment and loss on retirement of fixed assets	228	1,687
Amortization of non-cash warrant	416	0
Loss on impairment of long-term investment	0	1,476
Deferred income taxes, net	(38)	38
Provision for excess and obsolete inventories	5,094	5,203
Allowance for doubtful accounts and returns	3,274	697
Other non-cash adjustments, net	189	144
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	23,479	(16,000)
Inventories	2,912	3,158
Prepaid expenses and other assets	5,933	(4,148)
Accounts payable	1,434	2,168
Deferred revenue	1,308	25,956
Income taxes payable	228	(122)
Accrued and other liabilities	(7,662)	(7,029)
Net cash provided by (used in) operating activities	2,614	(8,293)
Cash flows from investing activities:
Acquisition of business, net of cash acquired	0	(72,989)
Proceeds from maturities of investments	3,106	12,842
Purchases of property and equipment	3,792	0
Purchases of property and equipment	(5,943)	(7,708)
Net cash provided by (used in) investing activities	955	(67,855)
Cash flows from financing activities:
Payment of convertible debt issuance costs	0	(582)
Proceeds from other debts and capital leases	164	5,972
Repayment of other debts and capital leases	(6,650)	(6,524)
Proceeds from common stock issued to employees	2,117	3,737
Payment of tax withholding obligations related to net share settlements of restricted stock units	(2,726)	(1,034)
Net cash (used in) provided by financing activities	(7,095)	1,569
Effect of exchange rate changes on cash and cash equivalents	776	(95)
Net decrease in cash and cash equivalents	(2,750)	(74,674)
Cash and cash equivalents at beginning of period	55,635	126,190
Cash and cash equivalents at end of period	$ 52,885	$ 51,516