CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and Cash Equivalents	$ 31,533	$ 24,310
Marketable Securities	53,535	69,712
Accounts and Other Receivables	2,307	3,162
Prepaid and Other Current Assets	1,476	1,895
Total Current Assets	88,851	99,079
Property and Equipment, Net	5,462	6,111
Operating Lease Right-of-Use Assets, Net	4,445
Intangible Assets, Net	48,690	48,690
Other Assets	129	1,929
Total Assets	147,577	155,809
Current Liabilities:
Accounts Payable	1,105	1,069
Accrued Expenses	5,474	7,007
Current Portion of Operating Lease Liabilities	2,633
Current Portion of Other Long-Term Liabilities	2,777	4,526
Total Current Liabilities	11,989	12,602
Long-Term Portion of Operating Lease Liabilities	2,599
Other Long-Term Liabilities	20,296	19,147
Total Liabilities	34,884	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 March 31, 2019 and December 31, 2018
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 12,844,711 and 11,957,635 Shares Issued and Outstanding at March 31, 2019 and December 31, 2018, Respectively	13	12
Additional Paid-In Capital	1,089,755	1,083,903
Accumulated Other Comprehensive Income	2,602	2,583
Accumulated Deficit	(979,677)	(962,438)
Total Stockholders' Equity	112,693	124,060
Total Liabilities and Stockholders' Equity	$ 147,577	$ 155,809