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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 exrcise 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, 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 (28,387)          
Other comprehensive loss (666)          
Ending balance (in shares) at Sep. 30, 2019   98,188,502        
Ending balance at Sep. 30, 2019 134,212 $ 487,668 (360,337) 3,177 130,508 3,704
Beginning balance ( in shares) at Mar. 31, 2019   93,102,682        
Beginning balance at Mar. 31, 2019 136,268 $ 472,987 (344,185) 3,707 132,509 3,759
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (9,314)   (9,312)   (9,312) (2)
Other comprehensive loss (771)     (771) (771)  
Shares issued for cash by at-the-market offering (in shares)   2,141,817        
Shares issued for cash by at-the-market offering 6,595 $ 6,595     6,595  
Shares issued to settle liabilities (in shares)   266,272        
Shares issued to settle liabilities 847 $ 847     847  
Share issuance cost (151) (151)     (151)  
Share-based compensation 663 $ 663     663  
shares issued for exrcise of stock options (in shares)   20,899        
Shares issued for exercise of stock options 44 $ 44     44  
Shares issued for exercise of warrants (in shares)   1,450        
Shares issued for exercise of warrants 5 $ 5     5  
Shares issued for consulting services (in shares)   18,237        
Shares issued for consulting services 63 $ 63     63  
Contributions attributable to non-controlling interest 46         46
Ending balance (in shares) at Jun. 30, 2019   95,551,357        
Ending balance at Jun. 30, 2019 134,295 $ 481,053 (353,497) 2,936 130,492 3,803
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (6,939)   (6,840)   (6,840) (99)
Other comprehensive loss 241     241 241  
Shares issued for cash by at-the-market offering (in shares)   2,618,297        
Shares issued for cash by at-the-market offering 5,978 $ 5,978     5,978  
Share issuance cost (134) (134)     (134)  
Share-based compensation 714 $ 714     714  
Shares issued for consulting services (in shares)   18,848        
Shares issued for consulting services 57 $ 57     57  
Ending balance (in shares) at Sep. 30, 2019   98,188,502        
Ending balance at Sep. 30, 2019 134,212 $ 487,668 (360,337) 3,177 130,508 3,704
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 public offering (in shares)   11,300,000        
Shares issued for cash by public offering 16,611 $ 16,611     16,611  
Shares issued for cash by at-the-market offering (in shares)   2,388,815        
Shares issued for cash by at-the-market offering 4,047 $ 4,047     4,047  
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        
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (415) $ (415)     (415)  
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
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 (22,792)          
Other comprehensive loss (398)          
Ending balance (in shares) at Sep. 30, 2020   130,273,504        
Ending balance at Sep. 30, 2020 154,282 $ 540,690 (392,735) 2,591 150,546 3,736
Beginning balance ( in shares) at Mar. 31, 2020   114,945,157        
Beginning balance at Mar. 31, 2020 144,962 $ 513,692 (375,693) 3,141 141,140 3,822
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (8,190)   (8,187)   (8,187) (3)
Other comprehensive loss (379)     (379) (379)  
Shares issued for cash by at-the-market offering (in shares)   5,559,548        
Shares issued for cash by at-the-market offering 8,969 $ 8,969     8,969  
Share issuance cost (202) (202)     (202)  
Share-based compensation 704 $ 704     704  
Shares issued for consulting services (in shares)   30,000        
Shares issued for consulting services 33 $ 33     33  
Ending balance (in shares) at Jun. 30, 2020   120,534,705        
Ending balance at Jun. 30, 2020 145,897 $ 523,196 (383,880) 2,762 142,078 3,819
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (8,938)   (8,855)   (8,855) (83)
Other comprehensive loss (171)     (171) (171)  
Shares issued for cash by at-the-market offering (in shares)   9,708,799        
Shares issued for cash by at-the-market offering 17,168 $ 17,168     17,168  
Share issuance cost (388) (388)     (388)  
Share-based compensation 668 $ 668     668  
Shares issued for consulting services (in shares)   30,000        
Shares issued for consulting services 46 $ 46     46  
Ending balance (in shares) at Sep. 30, 2020   130,273,504        
Ending balance at Sep. 30, 2020 $ 154,282 $ 540,690 $ (392,735) $ 2,591 $ 150,546 $ 3,736