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Stock-based Compensation (Restricted stock award) (Details) - Restricted Stock [Member] - C3J Stock Plan 2016 [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Shares    
Forfeited/Cancelled (in shares) (44,255)  
Issued as Common Stock (29,108) 416,856
Outstanding at end of period (in shares) 343,493  
Weighted Avg Grant Date Fair Value    
Forfeited/Cancelled (in dollars per share) $ 1.29  
Issued as Common Stock 1.95 $ 1.88
Outstanding at end of period (in dollars per share) $ 1.42