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Stockholders' Equity - Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 05, 2019
Dec. 06, 2018
Dec. 31, 2019
Dec. 31, 2018
Stockholders' Equity        
Shares underlying exercised     166,407  
Restricted Stock Units        
Stockholders' Equity        
Number of shares granted 2,170,585 1,255,000 2,500,585 1,255,000
Restricted Stock Units | Vesting period One        
Stockholders' Equity        
Vesting percentage 50.00% 25.00%    
Offering price $ 0.72 $ 0.64    
Restricted Stock Units | Vesting period Two        
Stockholders' Equity        
Vesting percentage 50.00% 25.00%    
Offering price $ 0.72 $ 0.65