Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 8,397	$ 7,298
Short-term investments	43,964	48,987
Accounts and other receivables (net of allowances for doubtful accounts as of: June 30, 2012 - $33 and December 31, 2011 - $21)	2,748	1,487
Inventories	403	423
Deferred income taxes	215	215
Prepaid expenses and other current assets	743	479
Total current assets	56,470	58,889
Property and equipment, net	1,520	1,737
Intangibles and other assets, net	14,933	14,053
Total assets	72,923	74,679
Current liabilities:
Accounts payable	1,678	365
Accrued compensation	2,089	2,830
Other current liabilities	1,778	2,054
Deferred revenue and customer advances	5,109	4,120
Total current liabilities	10,654	9,369
Long-term deferred revenue	11,738	13,229
Deferred income tax liabilities	215	215
Other long-term liabilities	604	245
Total liabilities	23,211	23,058
Contingencies (Notes13)
Stockholders' equity:
Common stock and additional paid-in capital-$0.001 par value; 100,000,000 shares authorized; shares issued: June 30, 2012 - 32,222,273 and December 31, 2011 - 31,786,030; shares outstanding: June 30, 2012 - 27,906,779 and December 31, 2011 - 27,857,824	185,038	182,508
Accumulated other comprehensive income	101	118
Accumulated deficit	(108,531)	(106,157)
Treasury stock at cost: June 30, 2012 - 4,315,494 shares and December 31, 2011 - 3,928,206 shares	(26,896)	(24,848)
Total stockholders' equity	49,712	51,621
Total liabilities and stockholders' equity	$ 72,923	$ 74,679