CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 68,012	$ 75,807
Prepaid expenses and other current assets	583	189
Total current assets	68,595	75,996
Fixed assets, net	64	75
Other assets, net	3,150	2,906
Total assets	71,809	78,977
Current Liabilities
Accounts payable	3,362	2,966
Accrued expenses	547	586
Total current liabilities	3,909	3,552
Commitments & Contingencies (note 6)
Stockholders' Equity
Undesignated Preferred Stock, $.001 par value, 5,000,000 shares authorized, none issued and outstanding	0	0
Common Stock, $.001 par value, 75,000,000 shares authorized, 23,209,762 and 23,125,565 shares issued, respectively; 23,097,412 and 23,013,215 shares outstanding, respectively	23	23
Additional paid-in capital	315,429	314,405
Cost of treasury stock, 112,350 shares	(1,380)	(1,380)
Deficit accumulated during the development stage	(246,172)	(237,623)
Total stockholders' equity	67,900	75,425
Total liabilities and stockholders' equity	$ 71,809	$ 78,977