CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 6,904	$ 4,558
Short-term investments	56,982	38,988
Accounts and other receivables (net of allowances for doubtful accounts of: $157 and $134, respectively)	873	1,878
Inventories	41	141
Deferred income taxes	165	165
Prepaid expenses and other current assets	945	706
Total current assets	65,910	46,436
Property and equipment, net	1,118	1,281
Intangibles and other assets, net	16,575	15,725
Total assets	83,603	63,442
Current liabilities:
Accounts payable	598	338
Accrued compensation	2,459	2,502
Other current liabilities	1,035	1,022
Deferred revenue and customer advances	13,990	3,934
Total current liabilities	18,082	7,796
Long-term deferred revenue	8,817	10,221
Deferred income tax liabilities	165	165
Other long-term liabilities	573	619
Total liabilities	27,637	18,801
Contingencies (Note 13)
Stockholders' equity:
Common stock and additional paid-in capital - $0.001 par value; 100,000,000 shares authorized; 33,501,139 and 32,278,330 shares issued, respectively; 28,518,395 and 27,295,586 shares outstanding, respectively	195,122	186,822
Accumulated other comprehensive income	105	109
Accumulated deficit	(108,692)	(111,721)
Treasury stock at cost: 4,982,744 shares	(30,569)	(30,569)
Total stockholders' equity	55,966	44,641
Total liabilities and stockholders' equity	$ 83,603	$ 63,442