Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Current assets:
Cash and cash equivalents	$ 47,345	$ 62,915
Marketable securities	47,939	46,993
Accounts receivable, net of allowances of $90 and $82, respectively	19,747	21,388
Inventories	43,545	39,659
Inventories-delivered systems	1,524	2,274
Prepaid expenses and other	7,141	7,492
Deferred income tax assets	12,555	8,593
Total current assets	179,796	189,314
Property, plant and equipment, net	42,938	43,213
Goodwill	11,041	11,352
Intangible assets, net	9,938	10,980
Deferred income tax assets	3,591	3,671
Other assets	829	924
Total assets	248,133	259,454
Current liabilities:
Accounts payable	6,362	6,398
Accrued payroll and related expenses	5,926	6,670
Deferred revenue	8,221	8,485
Other current liabilities	8,385	7,822
Income taxes payable	274	424
Current portion of debt obligations	945	928
Total current liabilities	30,113	30,727
Deferred revenue	3,746	4,307
Income taxes payable	2,280	2,135
Other long-term liabilities	2,011	2,140
Debt obligations	4,131	4,374
Total liabilities	42,281	43,683
Commitments and contingencies (Note 16)
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; 23,095,612 and 23,250,429, respectively, issued and outstanding	23	23
Additional paid-in capital	235,928	238,326
Accumulated deficit	(29,432)	(23,850)
Accumulated other comprehensive income	(667)	1,272
Total stockholders' equity	205,852	215,771
Total liabilities and stockholders' equity	$ 248,133	$ 259,454