CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 29, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (16,607)	$ (55,527)
Adjustments to reconcile net loss to net cash provided by operating activities:
Amortization of intangibles	4,194	4,144
Depreciation	6,771	7,139
Stock-based compensation	8,769	7,387
Amortization of discount on convertible debt and issuance cost	2,954	2,676
Restructuring, asset impairment and loss on retirement of fixed assets	93	228
Amortization of non-cash warrant	395	416
Deferred income taxes, net	530	(38)
Foreign currency adjustments	(1,042)	1,131
Provision for excess and obsolete inventories	822	5,094
Allowance for doubtful accounts and returns	623	3,274
Other non-cash adjustments, net	64	189
Changes in operating assets and liabilities:
Accounts receivable	(13,572)	23,479
Inventories	2,000	2,912
Prepaid expenses and other assets	1,897	5,933
Accounts payable	(4,187)	1,434
Deferred revenue	9,378	1,308
Income taxes payable	503	228
Accrued and other liabilities	(337)	(8,793)
Net cash provided by operating activities	3,248	2,614
Cash flows from investing activities:
Proceeds from maturities of investments	0	3,106
Proceeds from sales of investments	0	3,792
Purchases of property and equipment	(3,181)	(5,943)
Net cash (used in) provided by investing activities	(3,181)	955
Cash flows from financing activities:
Proceeds from other debts and capital leases	0	164
Repayment of other debts and capital leases	(6,176)	(6,650)
Proceeds from common stock issued to employees	2,366	2,117
Payment of tax withholding obligations related to net share settlements of restricted stock units	(54)	(2,726)
Net cash used in financing activities	(3,864)	(7,095)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(588)	935
Net decrease in cash, cash equivalents and restricted cash	(4,385)	(2,591)
Cash, cash equivalents and restricted cash at beginning of period	58,757	57,420
Cash, cash equivalents and restricted cash at end of period	54,372	54,829
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Total Cash, Cash Equivalents and Restricted Cash	$ 58,757	$ 57,420

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration