Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2013	Dec. 29, 2012
Current assets:
Cash and cash equivalents	$ 39,102	$ 62,915
Marketable securities	47,162	46,993
Accounts receivable, net of allowances of $174 and $82, respectively	32,191	21,388
Inventories	39,248	39,659
Inventories-delivered systems	2,444	2,274
Prepaid expenses and other	8,221	7,492
Deferred income tax assets	15,083	8,593
Total current assets	183,451	189,314
Property, plant and equipment, net	43,831	43,213
Goodwill	11,255	11,352
Intangible assets, net	9,226	10,980
Deferred income tax assets	3,582	3,671
Other assets	680	924
Total assets	252,025	259,454
Current liabilities:
Accounts payable	8,630	6,398
Accrued payroll and related expenses	5,466	6,670
Deferred revenue	11,847	8,485
Other current liabilities	8,929	7,822
Income taxes payable	244	424
Current portion of debt obligations	4,846	928
Total current liabilities	39,962	30,727
Deferred revenue	3,459	4,307
Income taxes payable	2,280	2,135
Other long-term liabilities	2,070	2,140
Debt obligations	0	4,374
Total liabilities	47,771	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; 23,186,957 and 23,250,429, respectively, issued and outstanding	23	23
Additional paid-in capital	238,939	238,326
Accumulated deficit	(33,998)	(23,850)
Accumulated other comprehensive income (loss)	(710)	1,272
Total stockholders' equity	204,254	215,771
Total liabilities and stockholders' equity	$ 252,025	$ 259,454