Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 15,049	$ 13,524
Restricted cash	129	0
Accounts receivable, net of allowance for doubtful accounts of $446 and $488 at March 31, 2013 and December 31, 2012, respectively	17,560	17,862
Inventories	9,430	11,079
Prepaid expenses and other	999	567
Total current assets	43,167	43,032
Property and equipment, net	2,427	2,458
Deposits and other	302	309
Total assets	45,896	45,799
Current liabilities:
Accounts payable	4,908	4,036
Accrued expenses	4,925	4,948
Deferred revenue	3,840	4,568
Revolving line of credit	5,535	5,535
Total current liabilities	19,208	19,087
Long-term liabilities	774	713
Stockholders' equity
Preferred Stock - $0.001 par value; 2,000 shares authorized	0	0
Common stock - $0.001 par value; 30,000 shares authorized; 19,298 and 19,171 issued and 19,244 and 19,125 outstanding at March 31, 2013 and December 31, 2012 repectively	19	19
Treasury stock	(180)	(144)
Additional paid-in capital	289,144	288,619
Accumulated deficit	(263,090)	(262,817)
Other accumulated comprehensive income	21	322
Total stockholders' equity	25,914	25,999
Total liabilities and stockholders' equity	$ 45,896	$ 45,799