BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and Cash Equivalents	$ 42,461	$ 72,108
Marketable Securities	147,315	217,781
Accounts and Other Receivables	1,784	970
Prepaid and Other Current Assets	4,009	4,077
Total Current Assets	195,569	294,936
Property and Equipment, Net	13,192	11,461
Intangible Assets, Net	81,487	20,794
Other Assets	2,134	1,428
Goodwill	90,976	8,965
Total Assets	383,358	337,584
Current Liabilities:
Accounts Payable	1,740	1,506
Accrued Expenses	28,657	24,316
Current Portion of Long-Term Liabilities	4,826	4,418
Total Current Liabilities	35,223	30,240
Other Long-Term Liabilities	82,704	17,239
Total Liabilities	117,927	47,479
Commitments and Contingent Liabilities (Notes 13 and 15)
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at December 31, 2016 and 2015
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 120,516,654 and 98,685,595 Shares Issued and Outstanding at December 31, 2016 and 2015, respectively	121	99
Additional Paid-In Capital	982,255	878,655
Accumulated Other Comprehensive Income	2,541	2,307
Accumulated Deficit	(719,486)	(590,956)
Total Stockholders' Equity	265,431	290,105
Total Liabilities and Stockholders' Equity	$ 383,358	$ 337,584