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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
Net Income (Loss) Attributable to Parent $ (10,829)   $ (10,822)   $ (10,822) $ (7)
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]            
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
Net Income (Loss) Attributable to Parent (17,582)          
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]            
Other comprehensive loss 657          
Ending balance (in shares) at Sep. 30, 2018   89,529,624        
Ending balance at Sep. 30, 2018 144,753 $ 462,319 (324,298) 2,946 140,967 3,786
Net Income (Loss) Attributable to Parent 7,144   7,149   7,149 (5)
Beginning balance ( in shares) at Mar. 31, 2018   75,977,269        
Beginning balance at Mar. 31, 2018 119,661 $ 431,818 (317,635) 1,602 115,785 3,876
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Other comprehensive loss 69     69 69  
Shares issued for cash by at-the-market offering (in shares)   10,504,702        
Shares issued for cash by at-the-market offering 21,442 $ 21,442     21,442  
Share issuance cost (536) (536)     (536)  
Share-based compensation 520 520     520  
Shares issued for consulting services (311) $ (311)     (311)  
Shares issued for consulting services (in shares)   164,538        
Ending balance (in shares) at Jun. 30, 2018   86,646,509        
Ending balance at Jun. 30, 2018 148,611 $ 453,555 (310,486) 1,671 144,740 3,871
Net Income (Loss) Attributable to Parent (13,897)   (13,812)   (13,812) (85)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Other comprehensive loss 1,275     1,275 1,275  
Shares issued for cash by at-the-market offering (in shares)   1,357,719        
Shares issued for cash by at-the-market offering 3,677 $ 3,677     3,677  
Share issuance cost (209) (209)     (209)  
Share-based compensation 519 519     519  
Shares issued for consulting services (53) $ (53)     (53)  
Shares issued for consulting services (in shares)   21,076        
Ending balance (in shares) at Sep. 30, 2018   89,529,624        
Ending balance at Sep. 30, 2018 144,753 $ 462,319 (324,298) 2,946 140,967 3,786
Net Income (Loss) Attributable to Parent (12,134)   (12,127)   (12,127) (7)
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]            
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 consulting services (52) $ (52)     (52)  
Shares issued for the vesting of restricted stock units (in shares)   850,150        
Shares issued for consulting services (in shares)   18,848        
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
Net Income (Loss) Attributable to Parent (28,387)          
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]            
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
Net Income (Loss) Attributable to Parent (9,314)   (9,312)   (9,312) (2)
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]            
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 for 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 exercise 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
Net Income (Loss) Attributable to Parent (6,939)   (6,840)   (6,840) (99)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
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