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Shareholders' Equity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Preferred stock, shares authorized 5,000,000   5,000,000
Preferred stock par value  
Preferred stock, shares issued  
Preferred stock, shares outstanding  
Common stock, shares authorized 150,000,000   150,000,000
Common stock par value  
Net proceeds from common stock $ 65,262 $ 7,597  
Common stock, shares issued 88,914,000   69,117,000
Common stock, shares outstanding 88,914,000   69,117,000
Common stock purchase warrants, shares issued 3,135,662    
Common stock purchase warrants, shares outstanding 3,135,662    
Warrant expiry date Oct. 17, 2029    
Minimum [Member]      
Common stock purchase warrants, exercise price $ 1.69    
Maximum [Member]      
Common stock purchase warrants, exercise price $ 5.50