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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, 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 income 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 Shares   2,388,815        
Shares Issued For Cash By At The Market Offering 4,047 $ 4,047     4,047  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 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 income (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 income (379)     (379) (379)  
Shares issued for cash by public offering (in shares)   5,559,548        
Shares issued for cash by public offering 8,969 $ 8,969     8,969  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 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 income (171)     (171) (171)  
Shares issued for cash by public offering (in shares)   9,708,799        
Shares issued for cash by public offering 17,168 $ 17,168     17,168  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 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
Beginning balance ( in shares) at Dec. 31, 2020   134,311,033        
Beginning balance at Dec. 31, 2020 157,546 $ 549,317 (397,812) 2,308 153,813 3,733
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (10,910)   (10,908)   (10,908) (2)
Other comprehensive income 353     353 353  
Shares Issued For Cash By At The Market Offering Shares   5,534,166        
Shares Issued For Cash By At The Market Offering 30,603 $ 30,603     30,603  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 689 689     689  
Share-based compensation 697 $ 697     697  
shares issued for exrcise of stock options (in shares)   278,111        
Shares issued for the vesting of restricted stock units 666 $ 666     666  
Shares issued for the vesting of restricted stock units (in shares)   478,781        
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (659) $ (659)     (659)  
Shares issued for exercise of warrants (in shares)   190,405        
Shares issued for exercise of warrants 1,105 $ 1,105     1,105  
Shares issued for consulting services (in shares)   (24,000)        
Shares issued for consulting services (95) $ (95)     (95)  
Ending balance (in shares) at Mar. 31, 2021   140,816,496        
Ending balance at Mar. 31, 2021 178,807 $ 581,135 (408,720) 2,661 175,076 3,731
Beginning balance ( in shares) at Dec. 31, 2020   134,311,033        
Beginning balance at Dec. 31, 2020 157,546 $ 549,317 (397,812) 2,308 153,813 3,733
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (29,658)          
Other comprehensive income 170          
Ending balance (in shares) at Sep. 30, 2021   154,494,078        
Ending balance at Sep. 30, 2021 249,831 $ 670,861 (427,374) 2,478 245,965 3,866
Beginning balance ( in shares) at Mar. 31, 2021   140,816,496        
Beginning balance at Mar. 31, 2021 178,807 $ 581,135 (408,720) 2,661 175,076 3,731
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (10,791)   (10,784)   (10,784) (7)
Other comprehensive income (897)     (897) (897)  
Shares Issued For Cash By At The Market Offering Shares   6,043,937        
Shares Issued For Cash By At The Market Offering 38,040 $ 38,040     38,040  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 855 855     855  
Share-based compensation 493 $ 493     493  
shares issued for exrcise of stock options (in shares)   251,960        
Shares issued for the vesting of restricted stock units 710 $ 710     710  
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (48) $ (48)     (48)  
Shares issued for exercise of warrants (in shares)   1,474,439        
Shares issued for exercise of warrants $ 10,093 $ 10,093     10,093  
Shares issued for consulting services (in shares)   (8,369)        
Shares issued for exercise of stock appreciation rights (in shares) 2,500          
Shares issued for consulting services $ (50) $ (50)     (50)  
Contributions attributable to non-controlling interest 229         229
Ending balance (in shares) at Jun. 30, 2021   148,597,701        
Ending balance at Jun. 30, 2021 215,831 $ 629,618 (419,504) 1,764 211,878 3,953
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (7,957)   (7,870)   (7,870) (87)
Other comprehensive income 714     714 714  
Shares Issued For Cash By At The Market Offering Shares   3,451,860        
Shares Issued For Cash By At The Market Offering 25,599 $ 25,599     25,599  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 576 576     576  
Share-based compensation 512 $ 512     512  
shares issued for exrcise of stock options (in shares)   85,521        
Shares issued for the vesting of restricted stock units 255 $ 255     255  
Shares issued for exercise of warrants (in shares)   2,351,179        
Shares issued for exercise of warrants 15,405 $ 15,405     15,405  
Shares issued for consulting services (in shares)   (7,817)        
Shares issued for consulting services (48) $ (48)     (48)  
Ending balance (in shares) at Sep. 30, 2021   154,494,078        
Ending balance at Sep. 30, 2021 $ 249,831 $ 670,861 $ (427,374) $ 2,478 $ 245,965 $ 3,866