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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 26,902 $ 24,189
Prepaid expenses and other current assets 3,453 4,640
Current assets of discontinued operations 124 171
Total current assets 30,479 29,000
Property, plant and equipment (net) 309 387
Total assets 30,788 29,387
Current liabilities:    
Accounts payable 2,609 2,792
Accrued and other current liabilities 3,806 4,626
Current liabilities of discontinued operations 75 75
Total current liabilities 6,490 7,493
Other liabilities 198 206
Total liabilities $ 6,688 $ 7,699
Commitments and contingencies    
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2014 and June 30, 2015; 335,273 shares issued and outstanding at December 31, 2014 and June 30, 2015. Aggregate preference in liquidation of $3,989,749 at December 31, 2014 and June 30, 2015.    
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2014 and June 30, 2015; 23,199,469 and 34,388,486 shares issued and outstanding at December 31, 2014 and June 30, 2015, respectively. $ 34 $ 23
Additional paid-in capital 341,530 330,962
Accumulated other comprehensive loss (388) (480)
Accumulated deficit (317,076) (308,817)
Total stockholders' equity 24,100 21,688
Total liabilities and stockholders' equity $ 30,788 $ 29,387