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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Balance at the beginning of the period (in shares) at Dec. 31, 2018     12,091      
Balance at the beginning of the period at Dec. 31, 2018 $ 11,052   $ 1 $ 128,367 $ (1) $ (117,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Employee Stock Purchase Plans     150      
Issuance of common stock under employee stock option and stock purchase plans 0          
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (in shares)     (50)      
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (111)     (111)    
Stock-based compensation 543     543    
Net loss from continuing operations (2,865)         (2,865)
Balance at the end of the period (in shares) at Mar. 31, 2019     12,191      
Balance at the end of the period at Mar. 31, 2019 8,433   $ 1 128,799 (1) (120,366)
Balance at the beginning of the period (in shares) at Dec. 31, 2019   0 12,428      
Balance at the beginning of the period at Dec. 31, 2019 3,996 $ 0 $ 1 128,872 (3) (124,874)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Employee Stock Purchase Plans     27      
Issuance of common stock under employee stock option and stock purchase plans 0          
Issuance of common stock and warrants (in shares)     3,442      
Issuance of common stock and warrants 2,750   $ 1 2,749    
Offering costs on issuance of common stock and warrants (474)     (474)    
Warrant liability (1,636)     (1,636)    
Conversion of notes to preferred stock 1,769     1,769    
Conversion of notes to preferred stock   2,709        
Stock-based compensation 20     20    
Net loss from continuing operations (541)         (541)
Balance at the end of the period (in shares) at Mar. 31, 2020   2,709 15,897      
Balance at the end of the period at Mar. 31, 2020 $ 5,884 $ 0 $ 2 $ 131,300 $ (3) $ (125,415)