Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 26,362	$ 29,128
Prepaid expenses and other current assets	305	533
Total current assets	26,667	29,661
Property and equipment, net		1
Intangible assets, net	12	15
Total assets	26,679	29,677
Current liabilities:
Accounts payable	775	906
Accrued expenses	1,065	729
Accrued dividends payable	68	68
Total liabilities	$ 1,908	$ 1,703
Commitments and contingencies (Note 8)
Stockholders' equity:
Undesignated stock, $0.01 par value; 20,000,000 shares authorized, 8,001,000 designated at June 30, 2015 and December 31, 2014
Series A 12% convertible preferred stock; 5,000,000 shares authorized, 1,402,500 issued and outstanding at June 30, 2015 and December 31, 2014, liquidation value $1,402,500 at June 30, 2015	$ 567	$ 567
Common stock, $0.001 par value; 50,000,000 shares authorized at June 30, 2015 and December 31, 2014, 23,788,913 and 22,277,283 issued and outstanding at June 30, 2015 and December 31, 2014, respectively	23	22
Additional paid-in capital	146,217	139,531
Retained deficit	(128,930)	(118,925)
Total stockholders' equity	17,877	21,195
Total liabilities, redeemable convertible preferred stock and stockholders' equity	26,679	29,677
Series B-1 12% redeemable convertible preferred stock
Current liabilities:
Convertible preferred stock, value	1,740	1,731
Series B-2 12% redeemable convertible preferred stock
Current liabilities:
Convertible preferred stock, value	3,431	3,325
Series C super dividend convertible preferred stock
Current liabilities:
Convertible preferred stock, value	$ 1,723	$ 1,723