Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Current assets:
Cash and cash equivalents	$ 43,833	$ 62,915
Marketable securities	49,057	46,993
Accounts receivable, net of allowances of $227 and $82, respectively	22,924	21,388
Inventories	36,543	39,659
Inventories-delivered systems	2,313	2,274
Prepaid expenses and other	7,534	7,492
Deferred income tax assets	18,091	8,593
Total current assets	180,295	189,314
Property, plant and equipment, net	46,597	43,213
Goodwill	11,580	11,352
Intangible assets, net	8,559	10,980
Deferred income tax assets	3,566	3,671
Other assets	723	924
Total assets	251,320	259,454
Current liabilities:
Accounts payable	11,967	6,398
Accrued payroll and related expenses	7,982	6,670
Deferred revenue	11,272	8,485
Other current liabilities	8,043	7,822
Income taxes payable	325	424
Current portion of debt obligations	0	928
Total current liabilities	39,589	30,727
Deferred revenue	3,531	4,307
Income taxes payable	2,334	2,135
Other long-term liabilities	2,064	2,140
Debt obligations	0	4,374
Total liabilities	47,518	43,683
Commitments and contingencies (Note 18)
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; 23,316,477 and 23,250,429, respectively, issued and outstanding	23	23
Additional paid-in capital	241,879	238,326
Accumulated deficit	(38,552)	(23,850)
Accumulated other comprehensive income	452	1,272
Total stockholders' equity	203,802	215,771
Total liabilities and stockholders' equity	$ 251,320	$ 259,454