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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 13,644 $ 15,362
Prepaid expenses and other current assets 353 432
Total current assets 13,997 26,400
Intangible assets, net   1
Total assets 13,997 15,795
Current liabilities:    
Accounts payable 1,346 910
Accrued expenses 3,016 2,802
Accrued dividends payable   68
Total current liabilities 4,362 3,780
Total liabilities 4,362 3,780
Commitments and contingencies (Note 8)
Stockholders' equity:    
Undesignated stock, $0.01 par value; 20,000,000 shares authorized, 20,000,000 and 14,001,000 designated at March 31, 2017 and December 31, 2016, respectively 0 0
Common stock, $0.001 par value; 50,000,000 shares authorized at March 31, 2017 and December 31, 2016, 34,670,684 and 32,912,942 issued and outstanding at March 31, 2017 and December 31, 2016, respectively 35 33
Additional paid-in capital 169,548 166,721
Retained deficit (168,910) (163,701)
Total stockholders' equity 7,912 10,292
Total liabilities, redeemable convertible preferred stock and stockholders' equity 13,997 15,795
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:    
Convertible preferred stock, value 557 557
Series B-1 12% convertible preferred stock    
Stockholders' equity:    
Convertible preferred stock, value 1,761 1,761
Series B-2 12% convertible preferred stock    
Stockholders' equity:    
Convertible preferred stock, value 3,697 3,697
Series B-3 8% convertible preferred stock    
Stockholders' equity:    
Convertible preferred stock, value $ 1,224 $ 1,224