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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, 2017   74,366,824        
Beginning balance at Dec. 31, 2017 $ 129,742 $ 430,383 $ (306,813) $ 2,289 $ 125,859 $ 3,883
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (10,829)   (10,822)   (10,822) (7)
Other comprehensive loss (687)     (687) (687)  
Shares issued for cash by at-the-market offering (in shares)   711,253        
Shares issued for cash by at-the-market offering 1,176 $ 1,176     1,176  
Share issuance cost (29) (29)     (29)  
Share-based compensation 1,202 $ 1,202     1,202  
Shares issued for the vesting of restricted stock units (in shares)   899,192        
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (914) $ (914)     (914)  
Ending balance (in shares) at Mar. 31, 2018   75,977,269        
Ending balance at Mar. 31, 2018 119,661 $ 431,818 (317,635) 1,602 115,785 3,876
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