Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 147,718	$ 165,404
Short term investments	34,986	21,954
Accounts receivable, net of allowance of $67 at June 28, 2014 and December 28, 2013	53,880	39,348
Unbilled revenue	862	856
Inventory	50,796	46,107
Deferred tax assets	21,054	20,144
Other current assets	16,701	6,848
Total current assets	325,997	300,661
Property and equipment, net	25,808	23,661
Deferred tax assets	11,192	10,095
Goodwill	48,751	48,751
Finite-Lived Intangible Assets, Net	20,891	22,668
Other assets	10,501	10,501
Total assets	443,140	416,337
Current liabilities:
Accounts payable	48,668	41,344
Accrued expenses	17,083	14,880
Employee-related Liabilities, Current	10,706	19,606
Deferred Revenue, Current	3,051	5,085
Total current liabilities	79,508	80,915
Long term liabilities	4,349	4,733
Commitments and contingencies (Note 6)
Redeemable convertible preferred stock, 5,000,000 shares authorized and none outstanding	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized; 29,548,160 and 28,935,253 shares issued and outstanding at June 28, 2014 and December 28, 2013, respectively	295	289
Additional paid-in capital	242,044	227,175
Retained earnings	116,888	103,078
Accumulated other comprehensive income	56	147
Total stockholders' equity	359,283	330,689
Total liabilities, redeemable convertible preferred stock and stockholders' equity	$ 443,140	$ 416,337