CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 79,221	$ 58,838
Accounts receivable	1,250	6,937
Other current assets	1,453	1,692
Total current assets	81,924	67,467
Auction rate securities	2,208	3,240
Fixed assets, at cost, net of accumulated depreciation and amortization	2,676	3,399
Deferred tax asset - long term	0	2,052
Intangible assets	32,300	0
Goodwill	7,702	0
Other assets	150	150
Total assets	126,960	76,308
Current liabilities:
Accounts payable and accrued expenses	5,961	5,640
Deferred tax liability - current	0	2,069
Deferred revenue - current	106	838
Other current liabilities	115	115
Total current liabilities	6,182	8,662
Acquisition-related contingent consideration liability	15,900	0
Deferred tax liability - long term	12,683	0
Other liabilities	915	1,078
Total liabilities	35,680	9,740
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $.001 par value; 20,000,000 shares authorized; issued and outstanding - none	0	0
Common stock, $.0013 par value; shares authorized - 160,000,000 in 2013 and 80,000,000 in 2012; issued - 59,737,697 in 2013 and 46,765,472 in 2012	78	61
Additional paid-in capital	541,761	493,613
Accumulated deficit	(447,626)	(424,105)
Accumulated other comprehensive loss	(192)	(260)
Treasury stock, at cost (200,000 shares in 2013 and 2012)	(2,741)	(2,741)
Total stockholders' equity	91,280	66,568
Total liabilities and stockholders' equity	$ 126,960	$ 76,308