Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 16,664	$ 4,558
Short-term investments	47,990	38,988
Accounts and other receivables (net of allowances for doubtful accounts of: $139 and $134, respectively)	294	1,878
Inventories	0	141
Deferred income taxes	165	165
Prepaid expenses and other current assets	870	706
Total current assets	65,983	46,436
Property and equipment, net	984	1,281
Intangibles and other assets, net	17,165	15,725
Total assets	84,132	63,442
Current liabilities:
Accounts payable	618	338
Accrued compensation	3,353	2,502
Other current liabilities	1,379	1,022
Deferred revenue and customer advances	11,186	3,934
Total current liabilities	16,536	7,796
Long-term deferred revenue	8,045	10,221
Deferred income tax liabilities	165	165
Other long-term liabilities	551	619
Total liabilities	25,297	18,801
Contingencies (Note 13)
Stockholders' equity:
Common stock and additional paid-in capital - $0.001 par value; 100,000,000 shares authorized; 33,581,408 and 32,278,330 shares issued, respectively; 28,598,664 and 27,295,586 shares outstanding, respectively	196,776	186,822
Accumulated other comprehensive income	115	109
Accumulated deficit	(107,487)	(111,721)
Treasury stock at cost: 4,982,744 shares	(30,569)	(30,569)
Total stockholders' equity	58,835	44,641
Total liabilities and stockholders' equity	$ 84,132	$ 63,442