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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balance at Dec. 31, 2017 $ 6 $ 177,076 $ (175,516) $ (13) $ 1,553
Balance (Cumulative Effect of Accounting Change [Member]) at Dec. 31, 2017     2,500   2,500
Balance (in shares) at Dec. 31, 2017 59,051,978        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for cash, net   27,051     27,052
Stock issued for cash, net (in shares) 7,510,555        
Stock issued for options and RSUs, net   135     135
Stock issued for options and RSUs, net (in shares) 317,314        
Stock-based compensation   4,055     4,055
Comprehensive income:          
Net loss     (25,406)   (25,406)
Change in foreign currency translation, net of tax         0
Change in unrealized losses, net of tax       (1) (1)
Comprehensive loss         (25,407)
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   10,539     10,539
Stock issued for cash, net (in shares) 1,860,483        
Stock issued for options and RSUs, net   670     670
Stock issued for options and RSUs, net (in shares) 846,434        
Stock-based compensation   3,711     3,711
Comprehensive income:          
Net loss     (19,180)   (19,180)
Change in foreign currency translation, net of tax       (3) (3)
Change in unrealized losses, net of tax       3 3
Comprehensive loss         (19,180)
Balance at Dec. 31, 2019 $ 7 $ 223,237 $ (217,602) $ (14) $ 5,628
Balance (in shares) at Dec. 31, 2019 69,586,764