CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and Cash Equivalents	$ 25,900	$ 24,897
Marketable Securities	129,083	59,065
Accounts and Other Receivables	12	44
Prepaid and Other Current Assets	1,435	1,108
Total Current Assets	156,430	85,114
Property and Equipment, Net	7,338	7,205
Intangible Assets, Net	23,326	23,833
Other Assets	174	424
Goodwill	8,965	8,965
Total Assets	196,233	125,541
Current Liabilities:
Accounts Payable	2,069	745
Accrued Expenses	9,904	10,960
Current Portion of Long-Term Liabilities	530	388
Current Portion of Term Loan		5,592
Total Current Liabilities	12,503	17,685
Term Loan, less Current Portion		5,746
Other Long-Term Liabilities	6,636	6,336
Total Liabilities	19,139	29,767
Commitments and Contingent Liabilities (Note 13)
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at June 30, 2013 and December 31, 2012
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 80,977,696 and 64,359,513 Shares Issued and Outstanding at June 30, 2013 and December 31, 2012, respectively	81	64
Additional Paid-In Capital	474,942	357,094
Accumulated Other Comprehensive Income	2,548	2,745
Accumulated Deficit	(300,477)	(264,129)
Total Stockholders' Equity	177,094	95,774
Total Liabilities and Stockholders' Equity	$ 196,233	$ 125,541