Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Current assets:
Cash and cash equivalents	$ 44,765	$ 62,915
Marketable securities	48,097	46,993
Accounts receivable, net of allowances of $293 and $82, respectively	31,436	21,388
Inventories	34,520	39,659
Inventories-delivered systems	6,901	2,274
Prepaid expenses and other	10,519	7,492
Deferred income tax assets	14,516	8,593
Total current assets	190,754	189,314
Property, plant and equipment, net	47,439	43,213
Goodwill	11,743	11,352
Intangible assets, net	7,864	10,980
Deferred income tax assets	4,338	3,671
Other assets	696	924
Total assets	262,834	259,454
Current liabilities:
Accounts payable	10,661	6,398
Accrued payroll and related expenses	7,853	6,670
Deferred revenue	21,749	8,485
Other current liabilities	7,936	7,822
Income taxes payable	758	424
Current portion of debt obligations	0	928
Total current liabilities	48,957	30,727
Deferred revenue	3,718	4,307
Income taxes payable	1,171	2,135
Other long-term liabilities	1,615	2,140
Debt obligations	0	4,374
Total liabilities	55,461	43,683
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.001 par value; 3,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value, 47,000,000 shares authorized; 23,537,275 and 23,250,429, respectively, issued and outstanding	24	23
Additional paid-in capital	244,733	238,326
Accumulated deficit	(37,996)	(23,850)
Accumulated other comprehensive income	612	1,272
Total stockholders’ equity	207,373	215,771
Total liabilities and stockholders’ equity	$ 262,834	$ 259,454