Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 7,298	$ 12,243
Short-term investments	48,987	48,961
Accounts and other receivables (net of allowances for doubtful accounts of: 2011 - $21; 2010 - $97)	1,487	815
Inventories	423	406
Deferred income taxes	215	342
Prepaid expenses and other current assets	479	3,821
Total current assets	58,889	66,588
Property and equipment, net	1,737	1,931
Intangibles and other assets, net	14,053	12,356
Total assets	74,679	80,875
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	365	393
Accrued compensation	2,830	3,507
Other current liabilities	2,054	1,488
Deferred revenue and customer advances	4,120	4,429
Total current liabilities	9,369	9,817
Long-term deferred revenue	13,229	16,494
Deferred income tax liabilities	215	342
Other long-term liabilities	245	538
Total liabilities	23,058	27,191
Commitments and contingencies (Notes 9 and 15)
Stockholders' equity:
Common stock and additional paid-in capital - $0.001 par value; 100,000,000 shares authorized; shares issued: December 31, 2011- 31,786,030 and December 31, 2010 - 31,016,812; shares outstanding: December 31, 2011 - 27,857,824 and December 31, 2010 - 28,228,603	182,508	176,515
Accumulated other comprehensive income	118	120
Accumulated deficit	(106,157)	(104,553)
Treasury stock at cost: December 31, 2011-3,928,206 and December 31, 2010 - 2,788,209 shares	(24,848)	(18,398)
Total stockholders' equity	51,621	53,684
Total liabilities and stockholders' equity	$ 74,679	$ 80,875