CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and Cash Equivalents	$ 42,497	$ 42,461
Marketable Securities	124,526	147,315
Accounts and Other Receivables	1,384	1,784
Prepaid and Other Current Assets	5,056	4,009
Total Current Assets	173,463	195,569
Property and Equipment, Net	12,411	13,192
Intangible Assets, Net	81,263	81,487
Other Assets	1,935	2,134
Goodwill	90,976	90,976
Total Assets	360,048	383,358
Current Liabilities:
Accounts Payable	2,660	1,740
Accrued Expenses	19,424	28,657
Current Portion of Long-Term Liabilities	4,940	4,826
Total Current Liabilities	27,024	35,223
Other Long-Term Liabilities	85,188	82,704
Total Liabilities	112,212	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 March 31, 2017 and December 31, 2016
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 124,173,729 and 120,516,654 Shares Issued and Outstanding at March 31, 2017 and December 31, 2016, respectively	124	121
Additional Paid-In Capital	998,897	982,255
Accumulated Other Comprehensive Income	2,562	2,541
Accumulated Deficit	(753,747)	(719,486)
Total Stockholders' Equity	247,836	265,431
Total Liabilities and Stockholders' Equity	$ 360,048	$ 383,358