CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current Assets:
Cash and Cash Equivalents	$ 81,584	$ 28,020
Marketable Securities	252,408	173,023
Accounts and Other Receivables	434	427
Prepaid and Other Current Assets	5,115	3,515
Total Current Assets	339,541	204,985
Property and Equipment, Net	11,735	10,535
Intangible Assets, Net	21,300	21,807
Other Assets	1,676	1,722
Goodwill	8,965	8,965
Total Assets	383,217	248,014
Current Liabilities:
Accounts Payable	2,020	2,603
Accrued Expenses	21,879	19,296
Current Portion of Long-Term Liabilities	2,792	2,592
Total Current Liabilities	26,691	24,491
Other Long-Term Liabilities	10,648	11,863
Total Liabilities	$ 37,339	$ 36,354
Commitments and Contingent Liabilities
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at June 30, 2015 and December 31, 2014
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 98,548,319 and 89,592,779 Shares Issued and Outstanding at June 30, 2015 and December 31, 2014, respectively	$ 99	$ 90
Additional Paid-In Capital	869,635	672,739
Accumulated Other Comprehensive Income	2,436	2,590
Accumulated Deficit	(526,292)	(463,759)
Total Stockholders' Equity	345,878	211,660
Total Liabilities and Stockholders' Equity	$ 383,217	$ 248,014