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Stockholders’ Equity (Deficit) - Preferred stock (Details) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Stockholders’ Equity (Deficit)    
Preferred stock, par value (in dollar per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 10,000,000 0
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0