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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 33,456 $ 31,146
Prepaid expenses and other current assets 3,422 3,388
Current assets of discontinued operations 403 639
Total current assets 37,281 35,173
Property and equipment (net) 305 275
Long-term assets of discontinued operations 24 72
Total assets 37,610 35,520
Current liabilities:    
Accounts payable 4,543 2,545
Accrued and other current liabilities 3,095 4,431
Other liabilities measured at fair value    20
Current liabilities of discontinued operations 145 260
Total current liabilities 7,783 7,256
Other liabilities 238 241
Total liabilities 8,021 7,497
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2013 and June 30, 2014; 335,273 shares issued and outstanding at December 31, 2013 and June 30, 2014. Aggregate preference in liquidation of $3,989,749 at December 31, 2013 and June 30, 2014.      
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2013 and June 30, 2014; 19,369,332 and 22,676,475 shares issued and outstanding at December 31, 2013 and June 30, 2014, respectively. 23 19
Additional paid-in capital 328,774 317,543
Accumulated other comprehensive income (loss) (97) (109)
Accumulated deficit (299,111) (289,430)
Total stockholders' equity 29,589 28,023
Total liabilities and stockholders' equity $ 37,610 $ 35,520