CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and Cash Equivalents	$ 75,627	$ 24,897
Marketable Securities	106,750	59,065
Accounts and Other Receivables	104	44
Prepaid and Other Current Assets	1,972	1,108
Total Current Assets	184,453	85,114
Property and Equipment, Net	7,131	7,205
Intangible Assets, Net	23,580	23,833
Other Assets	236	424
Goodwill	8,965	8,965
Total Assets	224,365	125,541
Current Liabilities:
Accounts Payable	2,451	745
Accrued Expenses	9,692	10,960
Current Portion of Long-Term Liabilities	557	388
Current Portion of Term Loan	5,630	5,592
Total Current Liabilities	18,330	17,685
Term Loan, less Current Portion	4,426	5,746
Other Long-Term Liabilities	6,668	6,336
Total Liabilities	29,424	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 March 31, 2013 and December 31, 2012
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 80,870,320 and 64,359,513 Shares Issued and Outstanding at March 31, 2013 and December 31, 2012, respectively	81	64
Additional Paid-In Capital	473,632	357,094
Accumulated Other Comprehensive Income	2,689	2,745
Accumulated Deficit	(281,461)	(264,129)
Total Stockholders' Equity	194,941	95,774
Total Liabilities and Stockholders' Equity	$ 224,365	$ 125,541