Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ (4,173)	$ 12,843
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	4,630	5,028
Stock-based compensation	6,336	6,458
Impairment of long-term investments	4,530	0
Deferred income taxes	1,042	1,148
Provision for excess and obsolete inventory	2,403	945
Other	(222)	(141)
Changes in assets and liabilities:
Accounts receivable	19,586	41,136
Inventories	52,484	6,803
Prepaid expenses and other assets	6,802	453
Accounts payable	(41,488)	(68,431)
Accrued employee compensation	(5,816)	(13,214)
Other accrued liabilities	(16,745)	(31,371)
Deferred revenue	452	1,733
Income taxes payable	(816)	(583)
Net cash provided by (used in) operating activities	29,005	(37,193)
Cash flows from investing activities:
Purchases of short-term investments	(126)	(146)
Proceeds from maturities of short-term investments	145	47,145
Purchases of property and equipment	(1,275)	(5,958)
Purchases of long-term investments	(250)	(5,200)
Net cash provided by (used in) investing activities	(1,506)	35,841
Cash flows from financing activities:
Repurchases of common stock	(15,008)	(15,000)
Restricted stock unit withholdings	(1,347)	(3,344)
Proceeds from exercise of stock options	462	2,026
Proceeds from issuance of common stock under employee stock purchase plan	2,478	2,303
Net cash used in financing activities	(13,415)	(14,015)
Net increase (decrease) in cash and cash equivalents	14,084	(15,367)
Cash and cash equivalents, at beginning of period	190,208	201,047
Cash and cash equivalents, at end of period	$ 204,292	$ 185,680