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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 10,136 $ 3,053
Prepaid expenses and other current assets 394 766
Total current assets 10,530 3,819
Other 86 342
Total assets 10,616 4,161
Current liabilities:    
Accounts payable 171 608
Accrued expenses 1,475 2,292
Accrued dividends payable   68
Total current liabilities 1,646 2,968
Total liabilities 1,646 2,968
Commitments and contingencies (Note 9)
Stockholders' equity (deficit):    
Undesignated stock, $0.01 par value; 20,000,000 shares authorized, 20,000,000 designated at September 30, 2018 and December 31, 2017, respectively 0 0
Common stock, $0.001 par value; 100,000,000 and 50,000,000 shares authorized at September 30, 2018 and December 31, 2017, respectively, 41,136,738 and 35,789,388 issued and outstanding at September 30, 2018 and December 31, 2017, respectively 41 36
Additional paid-in capital 192,843 173,363
Retained deficit (192,866) (181,168)
Total stockholders' equity (deficit) 7,247 (530)
Total liabilities, redeemable convertible preferred stock and stockholders' equity(deficit) 10,616 4,161
Series C super dividend convertible preferred stock    
Current liabilities:    
Convertible preferred stock, value 1,723 1,723
Series A 12% convertible preferred stock    
Stockholders' equity (deficit):    
Convertible preferred stock, value 547 557
Series B-1 12% convertible preferred stock    
Stockholders' equity (deficit):    
Convertible preferred stock, value 1,761 1,761
Series B-2 12% convertible preferred stock    
Stockholders' equity (deficit):    
Convertible preferred stock, value 3,697 3,697
Series B-3 8% convertible preferred stock    
Stockholders' equity (deficit):    
Convertible preferred stock, value $ 1,224 $ 1,224