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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock
Deficit
Accumulated other comprehensive income
Total shareholders' equity
Non-controlling interests
Beginning balance ( in shares) at Dec. 31, 2018   91,445,066        
Beginning balance at Dec. 31, 2018 $ 144,854 $ 469,303 $ (332,058) $ 3,843 $ 141,088 $ 3,766
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (12,134)   (12,127)   (12,127) (7)
Other comprehensive loss (136)     (136) (136)  
Shares issued for cash by at-the-market offering (in shares)   754,712        
Shares issued for cash by at-the-market offering 2,471 $ 2,471     2,471  
Share issuance cost (62) (62)     (62)  
Share-based compensation 1,121 $ 1,121     1,121  
Shares issued for exercise of stock options (in shares)   33,906        
Shares issued for exercise of stock options 102 $ 102     102  
Shares issued for the vesting of restricted stock units (in shares)   850,150        
Shares issued for consulting services (in shares)   18,848        
Shares issued for consulting services 52 $ 52     52  
Ending balance (in shares) at Mar. 31, 2019   93,102,682        
Ending balance at Mar. 31, 2019 136,268 $ 472,987 (344,185) 3,707 132,509 3,759
Beginning balance ( in shares) at Dec. 31, 2019   100,735,889        
Beginning balance at Dec. 31, 2019 130,607 $ 493,958 (370,036) 2,989 126,911 3,696
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (5,664)   (5,657)   (5,657) (7)
Other comprehensive loss 152     152 152  
Shares issued for cash by at-the-market offering (in shares)   13,688,815        
Shares issued for cash by at-the-market offering 20,658 $ 20,658     20,658  
Share issuance cost (1,563) (1,563)     (1,563)  
Share-based compensation 997 $ 997     997  
Shares issued for the vesting of restricted stock units (in shares)   490,453        
Shares issued for consulting services (in shares)   30,000        
Shares issued for consulting services 57 $ 57     57  
Contributions attributable to non-controlling interest 133         133
Ending balance (in shares) at Mar. 31, 2020   114,945,157        
Ending balance at Mar. 31, 2020 $ 144,962 $ 513,692 $ (375,693) $ 3,141 $ 141,140 $ 3,822