CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and Cash Equivalents	$ 39,824	$ 40,288
Marketable Securities	83,424	99,139
Accounts and Other Receivables	4,020	1,880
Prepaid and Other Current Assets	3,704	3,449
Total Current Assets	130,972	144,756
Property and Equipment, Net	9,785	10,372
Intangible Assets, Net	48,690	67,591
Other Assets	1,929	1,929
Goodwill		90,976
Total Assets	191,376	315,624
Current Liabilities:
Accounts Payable	508	1,715
Accrued Expenses	14,897	19,455
Current Portion of Long-Term Liabilities	8,607	6,566
Total Current Liabilities	24,012	27,736
Other Long-Term Liabilities	33,282	51,519
Total Liabilities	57,294	79,255
Commitments and Contingent Liabilities
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at March 31, 2018 and December 31, 2017
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 143,368,784 and 138,520,404 Shares Issued and Outstanding at March 31, 2018 and December 31, 2017, Respectively	143	139
Additional Paid-In Capital	1,060,768	1,046,183
Accumulated Other Comprehensive Income	2,559	2,564
Accumulated Deficit	(929,388)	(812,517)
Total Stockholders' Equity	134,082	236,369
Total Liabilities and Stockholders' Equity	$ 191,376	$ 315,624