Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 154,824	$ 165,404
Short term investments	30,540	21,954
Accounts receivable, net of allowance of $67 at March 29, 2014 and December 28, 2013	36,540	39,348
Unbilled revenue	931	856
Inventory	41,390	46,107
Deferred tax assets	19,950	20,144
Other current assets	10,436	6,848
Total current assets	294,611	300,661
Property and equipment, net	25,119	23,661
Deferred tax assets	10,433	10,095
Goodwill	48,751	48,751
Finite-Lived Intangible Assets, Net	21,764	22,668
Other assets	10,501	10,501
Total assets	411,179	416,337
Current liabilities:
Accounts payable	34,221	41,344
Accrued expenses	13,563	14,880
Employee-related Liabilities, Current	7,744	19,606
Deferred Revenue, Current	4,420	5,085
Total current liabilities	59,948	80,915
Long term liabilities	4,414	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; 29,435,149 and 28,935,253 shares issued and outstanding at March 29, 2014 and December 28, 2013, respectively	294	289
Additional paid-in capital	238,154	227,175
Retained earnings	108,358	103,078
Accumulated other comprehensive income	11	147
Total stockholders' equity	346,817	330,689
Total liabilities, redeemable convertible preferred stock and stockholders' equity	$ 411,179	$ 416,337