Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 185,957	$ 165,404
Short term investments	36,166	21,954
Accounts receivable, net of allowance of $67 at December 27, 2014 and December 28, 2013	71,056	39,348
Unbilled revenue	2,614	856
Inventory	47,857	46,107
Deferred tax assets	21,505	20,144
Other current assets	9,704	6,848
Total current assets	374,859	300,661
Property and equipment, net	31,297	23,661
Deferred tax assets	8,409	10,095
Goodwill	48,751	48,751
Intangible assets, net	19,146	22,668
Other assets	10,751	10,501
Total assets	493,213	416,337
Current liabilities:
Accounts payable	60,256	41,344
Accrued expenses	18,701	14,880
Accrued compensation	16,235	19,606
Deferred Revenue, Current	3,849	5,085
Total current liabilities	99,041	80,915
Long term liabilities	3,736	4,733
Commitments and contingencies (Note 11):
Redeemable convertible preferred stock, 5,000,000 shares authorized and no shares issued or outstanding	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized; and 29,644,602 and 28,935,253 shares issued and outstanding at December 27, 2014 and December 28, 2013, respectively	297	289
Additional paid-in capital	249,409	227,175
Retained earnings	140,881	103,078
Accumulated other comprehensive income	(151)	147
Total stockholders’ equity	390,436	330,689
Total liabilities, redeemable convertible preferred stock and stockholders’ equity	$ 493,213	$ 416,337