CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and Cash Equivalents	$ 11,232	$ 24,310
Marketable Securities	53,151	69,712
Accounts and Other Receivables	1,015	3,162
Prepaid and Other Current Assets	1,300	1,895
Total Current Assets	66,698	99,079
Property and Equipment, Net	4,031	6,111
Operating Lease Right-of-Use Assets, Net	3,473
Intangible Assets, Net	48,690	48,690
Other Assets	41	1,929
Total Assets	122,933	155,809
Current Liabilities:
Accounts Payable	1,174	1,069
Accrued Expenses	6,499	7,007
Current Portion of Operating Lease Liabilities	1,944
Current Portion of Long-Term Liabilities	2,026	4,526
Total Current Liabilities	11,643	12,602
Long-Term Portion of Operating Lease Liabilities	1,713
Other Long-Term Liabilities	15,551	19,147
Total Liabilities	28,907	31,749
Commitments and Contingent Liabilities (Note 14)
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at December 31, 2019 and 2018
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 16,972,077 and 11,957,635 Shares Issued and Outstanding at December 31, 2019 and 2018, Respectively	17	12
Additional Paid-In Capital	1,104,706	1,083,903
Accumulated Other Comprehensive Income	2,619	2,583
Accumulated Deficit	(1,013,316)	(962,438)
Total Stockholders' Equity	94,026	124,060
Total Liabilities and Stockholders' Equity	$ 122,933	$ 155,809