Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 12,283	$ 9,358
Marketable securities	41,425	46,386
Accounts receivable, net of allowance for doubtful accounts of approximately $1,427 as of March 31, 2014 and $1,705 as of December 31, 2013	28,173	27,549
Inventories	18,704	18,255
Prepaid expenses and other assets	4,726	3,784
Deferred income taxes	3,128	3,060
Total current assets	108,439	108,392
Property and equipment, less accumulated depreciation of $37,689 as of March 31, 2014 and $36,456 as of December 31, 2013	36,682	37,142
Intangible assets, less accumulated amortization of $2,465 as of March 31, 2014 and $2,005 as of December 31, 2013	14,654	14,987
Goodwill	18,407	18,281
Other non-current assets	4,801	5,047
Total assets	182,983	183,849
Current liabilities:
Accounts payable	8,445	8,876
Accrued compensation and employee-related expenses	4,387	5,859
Accrued other	8,183	7,325
Accrued product warranty costs	1,367	1,269
Deferred revenue	5,735	4,858
Current portion of long-term debt	1,282	1,272
Total current liabilities	29,399	29,459
Deferred income taxes	375	625
Other long-term liabilities	194	204
Line of credit	30,000	30,000
Long-term debt, excluding current portion	6,770	7,094
Total liabilities	66,738	67,382
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; 17,062,241 and 16,936,128 shares issued at March 31, 2014 and December 31, 2013; and 15,403,250 and 15,277,137 shares outstanding at March 31, 2014 and December 31, 2013, respectively	171	169
Additional paid-in capital	117,781	117,147
Retained earnings	10,717	11,840
Accumulated other comprehensive income	726	461
Less: treasury stock at cost, common stock, 1,658,991 shares as of March 31, 2014 and December 31, 2013	(13,150)	(13,150)
Total stockholders’ equity	116,245	116,467
Total liabilities and stockholders’ equity	$ 182,983	$ 183,849