CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and Cash Equivalents	$ 169,402	$ 24,897
Marketable Securities	133,581	59,065
Accounts and Other Receivables	489	44
Prepaid and Other Current Assets	1,717	1,108
Total Current Assets	305,189	85,114
Property and Equipment, Net	9,973	7,205
Intangible Assets, Net	22,820	23,833
Other Assets	148	424
Goodwill	8,965	8,965
Total Assets	347,095	125,541
Current Liabilities:
Accounts Payable	2,243	745
Accrued Expenses	17,179	10,960
Current Portion of Long-Term Liabilities	928	388
Current Portion of Term Loan		5,592
Total Current Liabilities	20,350	17,685
Term Loan, less Current Portion		5,746
Other Long-Term Liabilities	6,950	6,336
Total Liabilities	27,300	29,767
Commitments and Contingent Liabilities (Notes 14 and 16)
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at December 31, 2013 and 2012
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 89,246,832 and 64,359,513 Shares Issued and Outstanding at December 31, 2013 and 2012, respectively	89	64
Additional Paid-In Capital	662,717	357,094
Accumulated Other Comprehensive Income	2,668	2,745
Accumulated Deficit	(345,679)	(264,129)
Total Stockholders' Equity	319,795	95,774
Total Liabilities and Stockholders' Equity	$ 347,095	$ 125,541