CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Cash Flows from Operating Activities:
Net income (loss)	$ 5,249	$ (21,941)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	19,340	18,574
Amortization of debt discount and issuance costs	6,217	2,552
Amortization of premium on investments	2,720	870
Stock-based compensation expense	20,847	23,802
Other loss (gain)	15	(278)
Changes in assets and liabilities:
Accounts receivable	(35,463)	19,805
Inventory	(9,015)	(3,603)
Prepaid expenses and other assets	(4,965)	(6,427)
Accounts payable	11,009	(30,624)
Accrued liabilities and other expenses	657	1,640
Deferred revenue	(4,272)	(1,655)
Accrued warranty	4,898	6,680
Net cash provided by operating activities	17,237	9,395
Cash Flows from Investing Activities:
Purchase of available-for-sale investments	(214,272)	(206,528)
Purchase of cost-method investment	(5,500)	0
Proceeds from sale of available-for-sale investments	17,876	2,850
Proceeds from maturities and calls of investments	168,137	77,143
Purchase of property and equipment	(14,364)	(13,605)
Change in restricted cash	(320)	110
Net cash used in investing activities	(48,443)	(140,030)
Cash Flows from Financing Activities:
Proceeds from issuance of debt, net	0	144,469
Proceeds from issuance of common stock	19,683	21,551
Minimum tax withholding paid on behalf of employees for net share settlement	(1,846)	(1,541)
Net cash provided by financing activities	17,837	164,479
Effect of exchange rate changes on cash	(97)	(881)
Net change in cash and cash equivalents	(13,466)	32,963
Cash and cash equivalents at beginning of period	124,330	104,666
Cash and cash equivalents at end of period	110,864	137,629
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds	1,056	1,536
Cash paid for interest	1,313	0
Supplemental schedule of non-cash financing activities:
Transfer of inventory to fixed assets	$ 1,838	$ 6,672