BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and Cash Equivalents	$ 72,108	$ 28,020
Marketable Securities	217,781	173,023
Accounts and Other Receivables	970	427
Prepaid and Other Current Assets	4,077	3,515
Total Current Assets	294,936	204,985
Property and Equipment, Net	11,461	10,535
Intangible Assets, Net	20,794	21,807
Other Assets	1,428	1,722
Goodwill	8,965	8,965
Total Assets	337,584	248,014
Current Liabilities:
Accounts Payable	1,506	2,603
Accrued Expenses	24,316	19,296
Current Portion of Long-Term Liabilities	4,418	2,592
Total Current Liabilities	30,240	24,491
Other Long-Term Liabilities	17,239	11,863
Total Liabilities	$ 47,479	$ 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 December 31, 2015 and 2014
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 98,685,595 and 89,592,779 Shares Issued and Outstanding at December 31, 2015 and 2014, respectively	$ 99	$ 90
Additional Paid-In Capital	878,655	672,739
Accumulated Other Comprehensive Income	2,307	2,590
Accumulated Deficit	(590,956)	(463,759)
Total Stockholders' Equity	290,105	211,660
Total Liabilities and Stockholders' Equity	$ 337,584	$ 248,014