CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 27, 2020	Mar. 29, 2019
Cash flows from operating activities:
Net loss	$ (21,954)	$ (11,306)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of intangibles	1,655	2,083
Depreciation	2,843	2,846
Stock-based compensation	6,259	2,113
Amortization of discount on convertible debt	1,835	1,605
Amortization of non-cash warrant	434	25
Restructuring, asset impairment and loss on retirement of fixed assets	8	103
Deferred income taxes, net	653	(538)
Foreign currency adjustments	(2,066)	(638)
Provision for excess and obsolete inventories	234	254
Provision for doubtful accounts, returns and discounts	331	417
Other non-cash adjustments, net	113	287
Changes in operating assets and liabilities:
Accounts receivable	(5,068)	22,351
Inventories	(6,281)	(4,157)
Prepaid expenses and other assets	10,579	1,417
Accounts payable	(242)	(8,177)
Deferred revenue	12,477	4,750
Income taxes payable	(768)	(192)
Accrued and other liabilities	(12,083)	(9,027)
Net cash provided by (used in) operating activities	(11,041)	4,216
Cash flows from investing activities:
Purchases of property and equipment	(11,224)	(1,674)
Net cash used in investing activities	(11,224)	(1,674)
Cash flows from financing activities:
Payment of convertible debt issuance costs	(35)	0
Proceeds from other debts and finance leases	0	160
Repayment of other debts and finance leases	(406)	(97)
Proceeds from common stock issued to employees	3,000	2,012
Payment of tax withholding obligations related to net share settlements of restricted stock units	(829)	(657)
Net cash provided by financing activities	1,730	1,418
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(811)	(33)
Net increase (decrease) in cash, cash equivalents and restricted cash	(21,346)	3,927
Cash, cash equivalents and restricted cash at beginning of period	93,058	65,989
Cash, cash equivalents and restricted cash at end of period	71,712	69,916
Supplemental disclosures of cash flow information:
Income tax payments, net	408	490
Interest payments, net	1,095	92
Supplemental schedule of non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	$ 7,620	$ 91

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Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Amount of cash inflow from debt classified as other.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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Amount of cash outflow for short-term and long-term debt and lease obligation.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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Amount of noncash expense for share-based payment arrangement.

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