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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of accounting change | ASC 606 [Member]     $ 2,500   $ 2,500
Balance at Dec. 31, 2017 $ 6 $ 177,076 (175,516) $ (13) 1,553
Balance (in shares) at Dec. 31, 2017 59,051,978        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for cash, net   6,830     6,830
Stock issued for cash, net (in shares) 1,751,689        
Stock-based compensation   887     887
Stock issued for vested RSUs (in shares) 20,000        
Comprehensive (loss):          
Net Loss     (7,605)   (7,605)
Other comprehensive income (loss), net of tax       1 1
Comprehensive loss         (7,604)
Balance at Mar. 31, 2018 $ 6 184,793 (180,621) (12) 4,166
Balance (in shares) at Mar. 31, 2018 60,823,667        
Balance at Dec. 31, 2017 $ 6 177,076 (175,516) (13) 1,553
Balance (in shares) at Dec. 31, 2017 59,051,978        
Comprehensive (loss):          
Net Loss         (18,989)
Other comprehensive income (loss), net of tax         (1)
Comprehensive loss         (18,990)
Balance at Sep. 30, 2018 $ 7 205,375 (192,004) (14) 13,363
Balance (in shares) at Sep. 30, 2018 66,376,184        
Balance at Mar. 31, 2018 $ 6 184,793 (180,621) (12) 4,166
Balance (in shares) at Mar. 31, 2018 60,823,667        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for cash, net   4,809     4,809
Stock issued for cash, net (in shares) 1,320,921        
Stock-based compensation   1,121     1,121
Stock issued for vested RSUs (in shares) 148,219        
Comprehensive (loss):          
Net Loss     (6,450)   (6,450)
Comprehensive loss         (6,450)
Balance at Jun. 30, 2018 $ 6 190,723 (187,071) (12) 3,646
Balance (in shares) at Jun. 30, 2018 62,292,807        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for cash, net   13,634     13,635
Stock issued for cash, net (in shares) 4,083,377        
Stock-based compensation   1,018     1,018
Comprehensive (loss):          
Net Loss     (4,934)   (4,934)
Other comprehensive income (loss), net of tax       (2) (1)
Comprehensive loss         (4,935)
Balance at Sep. 30, 2018 $ 7 205,375 (192,004) (14) 13,363
Balance (in shares) at Sep. 30, 2018 66,376,184        
Balance at Dec. 31, 2018 $ 7 208,317 (198,422) (14) 9,888
Balance (in shares) at Dec. 31, 2018 66,879,847        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for cash, net   2,848     2,848
Stock issued for cash, net (in shares) 560,338        
Stock-based compensation   785     785
Exercise of options   816     816
Exercise of options (in shares) 663,816        
Comprehensive (loss):          
Net Loss     (5,608)   (5,608)
Other comprehensive income (loss), net of tax       1 1
Comprehensive loss         (5,607)
Balance at Mar. 31, 2019 $ 7 212,766 (204,030) (13) 8,730
Balance (in shares) at Mar. 31, 2019 68,104,001        
Balance at Dec. 31, 2018 $ 7 208,317 (198,422) (14) 9,888
Balance (in shares) at Dec. 31, 2018 66,879,847        
Comprehensive (loss):          
Net Loss         (14,694)
Other comprehensive income (loss), net of tax         2
Comprehensive loss         (14,692)
Balance at Sep. 30, 2019 $ 7 218,761 (213,116) (12) 5,640
Balance (in shares) at Sep. 30, 2019 68,958,301        
Balance at Mar. 31, 2019 $ 7 212,766 (204,030) (13) 8,730
Balance (in shares) at Mar. 31, 2019 68,104,001        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for cash, net   2,849     2,849
Stock issued for cash, net (in shares) 467,928        
Stock-based compensation   928     928
Stock issued for vested RSUs (in shares) 182,618        
Comprehensive (loss):          
Net Loss     (4,130)   (4,130)
Comprehensive loss         (4,130)
Balance at Jun. 30, 2019 $ 7 216,543 (208,160) (13) 8,377
Balance (in shares) at Jun. 30, 2019 68,754,547        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for cash, net   1,219     1,219
Stock issued for cash, net (in shares) 203,754        
Stock-based compensation   999     999
Comprehensive (loss):          
Net Loss     (4,956)   (4,956)
Other comprehensive income (loss), net of tax       1 1
Comprehensive loss         (4,955)
Balance at Sep. 30, 2019 $ 7 $ 218,761 $ (213,116) $ (12) $ 5,640
Balance (in shares) at Sep. 30, 2019 68,958,301