Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 67,464	$ 97,699
Marketable securities	37,335	0
Accounts receivable, net of allowances of $51 and $117, respectively	30,099	29,289
Inventories	43,054	52,260
Inventories-delivered systems	1,674	1,637
Prepaid expenses and other	10,116	8,119
Deferred income tax assets	7,736	12,406
Total current assets	197,478	201,410
Property, plant and equipment, net	43,080	35,521
Goodwill	11,079	11,990
Intangible assets, net	11,614	14,394
Deferred income tax assets	4,512	2,864
Other assets	885	1,042
Total assets	268,648	267,221
Current liabilities:
Accounts payable	5,329	7,975
Accrued payroll and related expenses	7,247	8,837
Deferred revenue	9,730	5,788
Other current liabilities	9,107	16,709
Income taxes payable	32	707
Current portion of debt obligations	911	765
Total current liabilities	32,356	40,781
Deferred revenue	5,020	4,547
Income taxes payable	2,430	2,401
Other long-term liabilities	1,978	2,813
Debt obligations	4,613	6,687
Total liabilities	46,397	57,229
Commitments and contingencies (Note 15)
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; 23,379,827 and 23,182,771, respectively, issued and outstanding	23	23
Additional paid-in capital	240,695	236,735
Accumulated deficit	(20,203)	(28,315)
Accumulated other comprehensive income	1,736	1,549
Total stockholders' equity	222,251	209,992
Total liabilities and stockholders' equity	$ 268,648	$ 267,221