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Stockholders' Equity - Summary of Preferred Stock (Details) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Summary of common and preferred stock authorized, issued and outstanding    
Preferred Stock, par value ($ per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (shares) 10,000,000 10,000,000
Preferred stock, shares issued (shares) 23 23
Preferred stock, shares outstanding (shares) 23 23
Series C Preferred Stock    
Summary of common and preferred stock authorized, issued and outstanding    
Preferred Stock, par value ($ per share) $ 0.001  
Preferred stock, shares authorized (shares) 1,091  
Preferred stock, shares issued (shares) 1,091  
Preferred stock, shares outstanding (shares) 23 23