Condensed Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash	$ 24,735	$ 7,005
Prepaid expenses	368	93
Other current assets	41	67
Total current assets	25,144	7,165
Property and equipment, net of accumulated depreciation of $272 and $268 at March 31, 2014 and December 31, 2013, respectively	32	36
License agreements, net of accumulated amortization of $1,430 and $1,406 at March 31, 2014 and December 31, 2013, respectively	70	93
Total assets	25,246	7,294
Current liabilities:
Accounts payable	432	476
Accrued research and development	515	317
Accrued other	448	458
Total current liabilities	1,395	1,251
Commitments and contingencies
Stockholders' equity
Preferred stock, $.01 par value, 15,000 shares authorized; No shares issued and outstanding
Common stock, $.01 par value, 70,000 shares authorized; 15,294 and 5,586 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	153	56
Additional paid-in capital	264,836	244,495
Accumulated deficit	(241,138)	(238,508)
Total stockholders' equity	23,851	6,043
Total liabilities and stockholders' equity	$ 25,246	$ 7,294