Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 36,045	$ 48,555
Restricted cash	37	37
Prepaid clinical expenses	458	1,528
Prepaid expenses and other current assets	622	137
Total current assets	37,162	50,257
Equipment and furnishings, net	1,510	279
Other assets	57	0
Total assets	38,729	50,536
Current liabilities:
Accounts payable	1,843	730
Accrued expenses	285	926
Accrued payroll and related expenses	410	424
Total current liabilities	2,538	2,080
Shareholders’ equity:
Common Stock, $0.0001 par value; 100,000,000 shares authorized, 15,250,840 and 15,225,980 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively	2	2
Additional paid-in capital	535,754	528,353
Accumulated deficit	(506,219)	(486,614)
Total shareholders’ equity	36,191	48,456
Total liabilities and shareholders' equity	38,729	50,536
Series C-1 Convertible Preferred Stock [Member]
Shareholders’ equity:
Convertible preferred stock, value	3,917	3,917
Series F Convertible Preferred Stock [Member]
Shareholders’ equity:
Convertible preferred stock, value	$ 2,737	$ 2,798