Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 38,281	$ 31,183
Short-term marketable securities	40,278	45,635
Accounts receivable (net of allowance for doubtful accounts; 2011 - $940, 2010 - $680)	22,646	14,306
Prepaid expenses and other current assets	7,040	6,541
Total current assets	108,245	97,665
Long-term marketable securities	8,835
Property and equipment, net	9,551	10,345
Restricted cash	113	608
Other assets	4,335	2,243
Total assets	131,079	110,861
Current liabilities:
Accounts payable	2,722	3,968
Accrued compensation	8,433	7,352
Accrued license fees	2,899	3,126
Accrued expenses and other current liabilities	6,708	5,584
Deferred revenues - current portion	1,284	1,295
Other current liabilities	282	243
Total current liabilities	22,328	21,568
Deferred revenues - long-term portion	504	1,526
Other liabilities	1,356	1,657
Commitments (Note 6)
Stockholders' equity:
Common stock	3	3
Additional paid-in capital	275,250	259,724
Accumulated other comprehensive loss	(42)	(10)
Accumulated deficit	(168,320)	(173,607)
Total stockholders' equity	106,891	86,110
Total liabilities and stockholders' equity	$ 131,079	$ 110,861