Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 8,242	$ 7,017
Marketable securities	22,782	23,553
Accounts receivable, net of allowance for doubtful accounts of approximately $592 as of June 30, 2012 and $623 as of December 31, 2011	22,264	25,959
Inventories	17,159	18,615
Prepaid expenses and other assets	2,942	2,552
Deferred income taxes	1,033	1,281
Total current assets	74,422	78,977
Property and equipment, less accumulated depreciation of $29,547 as of June 30, 2012 and $27,508 as of December 31, 2011	36,507	34,010
Intangible assets, less accumulated amortization of $601 as of June 30, 2012 and $434 as of December 31, 2011	1,736	1,903
Goodwill	4,426	4,426
Other non-current assets	4,170	3,835
Deferred income taxes	5,403	5,405
Total assets	126,664	128,556
Current liabilities:
Accounts payable	5,819	6,141
Accrued compensation and employee-related expenses	3,756	4,285
Accrued other	4,538	4,700
Accrued product warranty costs	924	933
Accrued professional fees	278	326
Deferred revenue	2,662	2,684
Current portion of long-term debt	134	131
Total current liabilities	18,111	19,200
Other long-term liabilities	128	135
Line of credit	7,000	9,000
Long-term debt excluding current portion	3,485	3,553
Total liabilities	28,724	31,888
Stockholders' equity:
Preferred stock, $0.01 par value. Authorized 1,000,000 shares; none issued
Common stock, $0.01 par value. Authorized 30,000,000 shares, 16,481,244 and 16,207,268 shares issued at June 30, 2012 and December 31, 2011; and 14,822,253 and 14,548,277 shares outstanding at June 30, 2012 and December 31, 2011, respectively	165	162
Additional paid-in capital	108,819	106,592
Retained earnings	2,805	3,727
Accumulated other comprehensive loss	(699)	(663)
Less: treasury stock at cost, common stock, 1,658,991 shares as of June 30, 2012 and December 31, 2011	(13,150)	(13,150)
Total stockholders' equity	97,940	96,668
Total liabilities and stockholders' equity	$ 126,664	$ 128,556