Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 10,139	$ 14,136
Short-term investments	52,989	56,976
Accounts and other receivables (net of allowances for doubtful accounts of $15 and $9)	2,992	598
Deferred income taxes	7,784	7,784
Prepaid expenses and other current assets	1,085	690
Total current assets	74,989	80,184
Property and equipment, net	1,280	944
Deferred income tax assets	27,527	29,066
Intangibles and other assets, net	299	381
Total assets	104,095	110,575
Current liabilities:
Accounts payable	1,019	682
Accrued compensation	1,665	4,680
Other current liabilities	1,483	1,653
Deferred revenue	13,007	8,920
Total current liabilities	17,174	15,935
Long-term deferred revenue	9,018	13,441
Other long-term liabilities	451	528
Total liabilities	26,643	29,904
Contingencies (Note 12)
Stockholders' equity:
Common stock and additional paid-in capital - $0.001 par value; 100,000,000 shares authorized; 34,188,969 and 33,619,766 shares issued, respectively; 28,055,082 and 28,637,022 shares outstanding, respectively	203,725	198,057
Accumulated other comprehensive income	117	112
Accumulated deficit	(83,823)	(86,929)
Treasury stock at cost: 6,133,887 and 4,982,744 shares, respectively	(42,567)	(30,569)
Total stockholders' equity	77,452	80,671
Total liabilities and stockholders' equity	$ 104,095	$ 110,575