CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 94,036	$ 65,860
Accounts receivable, net	817	2,879
Other current assets	2,845	1,943
Total current assets	97,698	70,682
Auction rate securities	2,208	2,208
Fixed assets, at cost, net of accumulated depreciation and amortization	2,280	2,413
Intangible assets, net (Note 5)	31,378	31,379
Goodwill	7,702	7,702
Other assets	158	157
Total assets	141,424	114,541
Current liabilities:
Accounts payable and accrued expenses	3,981	6,512
Other current liabilities	115	115
Total current liabilities	4,096	6,627
Contingent consideration liability	16,200	15,700
Deferred tax liability - long term	12,321	12,321
Other liabilities	913	914
Total liabilities	33,530	35,562
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; 160,000,000 shares authorized; issued - 69,775,404 in 2014 and 61,025,404 in 2013	91	79
Additional paid-in capital	586,726	548,510
Accumulated deficit	(475,990)	(466,677)
Accumulated other comprehensive loss	(192)	(192)
Treasury stock, at cost (200,000 shares in 2014 and 2013)	(2,741)	(2,741)
Total stockholders' equity	107,894	78,979
Total liabilities and stockholders' equity	$ 141,424	$ 114,541