Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 13,889	$ 7,298
Short-term investments	33,985	48,987
Accounts and other receivables (net of allowances for doubtful accounts as of: September 30, 2012 - 134 and December 31, 2011 - $21)	1,402	1,487
Inventories	359	423
Deferred income taxes	215	215
Prepaid expenses and other current assets	773	479
Total current assets	50,623	58,889
Property and equipment, net	1,426	1,737
Intangibles and other assets, net	15,447	14,053
Total assets	67,496	74,679
Current liabilities:
Accounts payable	1,717	365
Accrued compensation	2,412	2,830
Other current liabilities	2,478	2,054
Deferred revenue and customer advances	4,651	4,120
Total current liabilities	11,258	9,369
Long-term deferred revenue	10,999	13,229
Deferred income tax liabilities	215	215
Other long-term liabilities	584	245
Total liabilities	23,056	23,058
Contingencies (Notes13)
Stockholders' equity:
Common stock and additional paid-in capital - $0.001 par value; 100,000,000 shares authorized; shares issued: September 30, 2012 - 32,256,135 and December 31, 2011 - 31,786,030; shares outstanding: September 30, 2012 - 27,359,441 and December 31, 2011 - 27,857,824	185,950	182,508
Accumulated other comprehensive income	107	118
Accumulated deficit	(111,521)	(106,157)
Treasury stock at cost: September 30, 2012 - 4,896,694 shares and December 31, 2011 - 3,928,206 shares	(30,096)	(24,848)
Total stockholders' equity	44,440	51,621
Total liabilities and stockholders' equity	$ 67,496	$ 74,679