CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and Cash Equivalents	$ 66,162	$ 42,461
Marketable Securities	87,822	147,315
Accounts and Other Receivables	1,359	1,784
Prepaid and Other Current Assets	4,709	4,009
Total Current Assets	160,052	195,569
Property and Equipment, Net	12,069	13,192
Intangible Assets, Net	81,039	81,487
Other Assets	1,935	2,134
Goodwill	90,976	90,976
Total Assets	346,071	383,358
Current Liabilities:
Accounts Payable	1,975	1,740
Accrued Expenses	21,275	28,657
Current Portion of Long-Term Liabilities	5,538	4,826
Total Current Liabilities	28,788	35,223
Other Long-Term Liabilities	85,826	82,704
Total Liabilities	114,614	117,927
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, 2017 and December 31, 2016
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 127,411,975 and 120,516,654 Shares Issued and Outstanding at June 30, 2017 and December 31, 2016, respectively	127	121
Additional Paid-In Capital	1,011,066	982,255
Accumulated Other Comprehensive Income	2,577	2,541
Accumulated Deficit	(782,313)	(719,486)
Total Stockholders' Equity	231,457	265,431
Total Liabilities and Stockholders' Equity	$ 346,071	$ 383,358