CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and Cash Equivalents	$ 16,586	$ 24,310
Marketable Securities	56,332	69,712
Accounts and Other Receivables	727	3,162
Prepaid and Other Current Assets	1,458	1,895
Total Current Assets	75,103	99,079
Property and Equipment, Net	4,488	6,111
Operating Lease Right-of-Use Assets, Net	3,431
Intangible Assets, Net	48,690	48,690
Other Assets	129	1,929
Total Assets	131,841	155,809
Current Liabilities:
Accounts Payable	666	1,069
Accrued Expenses	6,419	7,007
Current Portion of Operating Lease Liabilities	2,253
Current Portion of Other Long-Term Liabilities	2,550	4,526
Total Current Liabilities	11,888	12,602
Long-Term Portion of Operating Lease Liabilities	1,482
Other Long-Term Liabilities	17,091	19,147
Total Liabilities	30,461	31,749
Commitments and Contingent Liabilities
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at September 30, 2019 and December 31, 2018
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 15,904,520 and 11,957,635 Shares Issued and Outstanding at September 30, 2019 and December 31, 2018, Respectively	16	12
Additional Paid-In Capital	1,101,598	1,083,903
Accumulated Other Comprehensive Income	2,635	2,583
Accumulated Deficit	(1,002,869)	(962,438)
Total Stockholders' Equity	101,380	124,060
Total Liabilities and Stockholders' Equity	$ 131,841	$ 155,809