CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Apr. 01, 2017	Mar. 26, 2016
Cash Flows from Operating Activities:
Net income (loss)	$ (40,451)	$ 11,808
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	15,951	14,666
Amortization of debt discount and issuance costs	2,730	2,469
Amortization of premium on investments	120	481
Impairment of intangible assets	252	0
Stock-based compensation expense	10,877	7,987
Other gain	(60)	0
Changes in assets and liabilities:
Accounts receivable	26,366	2,165
Inventory	(326)	(16,155)
Prepaid expenses and other assets	(5,767)	(274)
Accounts payable	(3,180)	(9,041)
Accrued liabilities and other expenses	(12,027)	(15,036)
Deferred revenue	12,943	9,776
Accrued warranty	(4,398)	1,133
Net cash provided by operating activities	3,030	9,979
Cash Flows from Investing Activities:
Purchase of available-for-sale investments	(84,422)	(37,393)
Proceeds from maturities of investments	46,679	63,759
Purchase of property and equipment	(14,743)	(10,844)
Change in restricted cash	1,626	(30)
Net cash provided by (used in) investing activities	(50,860)	15,492
Cash Flows from Financing Activities:
Security pledge to acquire noncontrolling interest	476	0
Acquisition of noncontrolling interest	(471)	0
Proceeds from issuance of common stock	9,808	7,787
Minimum tax withholding paid on behalf of employees for net share settlement	(151)	(2,444)
Net cash provided by financing activities	9,662	5,343
Effect of exchange rate changes on cash	1,185	59
Net change in cash and cash equivalents	(36,983)	30,873
Cash and cash equivalents at beginning of period	162,641	149,101
Cash and cash equivalents at end of period	125,658	179,974
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds	1,553	1,554
Cash paid for interest	3	37
Supplemental schedule of non-cash investing activities:
Transfer of inventory to fixed assets	$ 138	$ 1,409

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Balance Type:	credit
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

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration