Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 95,478	$ 97,699
Accounts receivable, net of allowances of $126 and $117, respectively	38,783	29,289
Inventories	48,978	52,260
Inventories - delivered systems	1,884	1,637
Prepaid expenses and other	10,629	8,119
Deferred income tax assets	9,527	12,406
Total current assets	205,279	201,410
Property, plant and equipment, net	38,255	35,521
Goodwill	11,951	11,990
Intangible assets, net	13,618	14,394
Deferred income tax assets	3,140	2,864
Other assets	892	1,042
Total assets	273,135	267,221
Current liabilities:
Accounts payable	10,364	7,975
Accrued payroll and related expenses	7,661	8,837
Deferred revenue	7,648	5,788
Other current liabilities	14,301	16,709
Income taxes payable	588	707
Current portion of debt obligations	775	765
Total current liabilities	41,337	40,781
Deferred revenue	5,441	4,547
Income taxes payable	2,411	2,401
Other long-term liabilities	2,151	2,813
Debt obligations	6,551	6,687
Total liabilities	57,891	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
Common stock, $0.001 par value, 47,000,000 shares authorized; 23,437,033 and 23,182,771, respectively, issued and outstanding	23	23
Additional paid-in capital	240,038	236,735
Accumulated deficit	(26,612)	(28,315)
Accumulated other comprehensive income	1,795	1,549
Total stockholders’ equity	215,244	209,992
Total liabilities and stockholders’ equity	$ 273,135	$ 267,221