Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 30,223	$ 4,558
Short-term investments	33,994	38,988
Accounts and other receivables (net of allowances for doubtful accounts of: $150 and $134, respectively)	3,342	1,878
Inventories	76	141
Deferred income taxes	165	165
Prepaid expenses and other current assets	523	706
Total current assets	68,323	46,436
Property and equipment, net	1,193	1,281
Intangibles and other assets, net	16,271	15,725
Total assets	85,787	63,442
Current liabilities:
Accounts payable	1,599	338
Accrued compensation	1,756	2,502
Other current liabilities	3,246	1,022
Deferred revenue and customer advances	19,139	3,934
Total current liabilities	25,740	7,796
Long-term deferred revenue	9,581	10,221
Deferred income tax liabilities	165	165
Other long-term liabilities	598	619
Total liabilities	36,084	18,801
Contingencies (Note 12)
Stockholders' equity:
Common stock and additional paid-in capital - $0.001 par value; 100,000,000 shares authorized; 32,761,512 and 32,278,330 shares issued, respectively; 27,778,768 and 27,295,586 shares outstanding, respectively	189,634	186,822
Accumulated other comprehensive income	106	109
Accumulated deficit	(109,468)	(111,721)
Treasury stock at cost: 4,982,744 shares	(30,569)	(30,569)
Total stockholders' equity	49,703	44,641
Total liabilities and stockholders' equity	$ 85,787	$ 63,442