CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and Cash Equivalents	$ 56,902	$ 169,402
Marketable Securities	217,324	133,581
Accounts and Other Receivables	305	489
Prepaid and Other Current Assets	2,288	1,717
Total Current Assets	276,819	305,189
Property and Equipment, Net	10,216	9,973
Intangible Assets, Net	22,567	22,820
Other Assets	132	148
Goodwill	8,965	8,965
Total Assets	318,699	347,095
Current Liabilities:
Accounts Payable	3,414	2,243
Accrued Expenses	14,966	17,179
Current Portion of Long-Term Liabilities	1,127	928
Total Current Liabilities	19,507	20,350
Other Long-Term Liabilities	7,346	6,950
Total Liabilities	26,853	27,300
Commitments and Contingent Liabilities
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at March 31, 2014 and December 31, 2013
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 89,357,843 and 89,246,832 Shares Issued and Outstanding at March 31, 2014 and December 31, 2013, respectively	89	89
Additional Paid-In Capital	664,669	662,717
Accumulated Other Comprehensive Income	2,670	2,668
Accumulated Deficit	(375,582)	(345,679)
Total Stockholders' Equity	291,846	319,795
Total Liabilities and Stockholders' Equity	$ 318,699	$ 347,095