Condensed Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash	$ 35,735	$ 30,031
Prepaid expenses	755	318
Other current assets		4
Total current assets	36,490	30,353
Property and equipment, net of accumulated depreciation of $247 and $242 at March 31, 2015 and December 31, 2014, respectively	32	37
Other assets	33	33
Total assets	36,555	30,423
Current liabilities:
Accounts payable	189	335
Accrued compensation and benefits	414	841
Accrued research and development	224	36
Accrued other	202	207
Total current liabilities	1,029	1,419
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; 26,545 and 20,705 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	265	207
Additional paid-in capital	289,188	279,952
Accumulated deficit	(253,927)	(251,155)
Total stockholders' equity	35,526	29,004
Total liabilities and stockholders' equity	$ 36,555	$ 30,423