Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 8,621	$ 7,017
Marketable securities	24,296	23,553
Accounts receivable, net of allowance for doubtful accounts of approximately $947 as of September 30, 2012 and $623 as of December 31, 2011	28,596	25,959
Inventories	17,842	18,615
Prepaid expenses and other assets	2,807	2,552
Deferred income taxes	410	1,281
Total current assets	82,572	78,977
Property and equipment, less accumulated depreciation of $30,539 as of September 30, 2012 and $27,508 as of December 31, 2011	36,157	34,010
Intangible assets, less accumulated amortization of $717 as of September 30, 2012 and $434 as of December 31, 2011	1,730	1,903
Goodwill	4,609	4,426
Other non-current assets	4,251	3,835
Deferred income taxes	4,782	5,405
Total assets	134,101	128,556
Current liabilities:
Accounts payable	6,612	6,141
Accrued compensation and employee-related expenses	5,150	4,285
Accrued other	7,796	5,026
Accrued product warranty costs	921	933
Deferred revenue	1,956	2,684
Current portion of long-term debt	136	131
Total current liabilities	22,571	19,200
Other long-term liabilities	132	135
Line of credit	7,000	9,000
Long-term debt excluding current portion	3,450	3,553
Total liabilities	33,153	31,888
Stockholders' equity:
Preferred stock, $0.01 par value. Authorized 1,000,000 shares; none issued	0	0
Common stock, $0.01 par value. Authorized 30,000,000 shares, 16,524,451 and 16,207,268 shares issued at September 30, 2012 and December 31, 2011; and 14,865,460 and 14,548,277 shares outstanding at September 30, 2012 and December 31, 2011, respectively	165	162
Additional paid-in capital	109,770	106,592
Retained earnings	4,549	3,727
Accumulated other comprehensive loss	(386)	(663)
Less: treasury stock at cost, common stock, 1,658,991 shares as of September 30, 2012 and December 31, 2011	(13,150)	(13,150)
Total stockholders' equity	100,948	96,668
Total liabilities and stockholders' equity	$ 134,101	$ 128,556