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Stockholders' Equity - Preferred Stock Issuances - Additional Information (Details) - USD ($)
Mar. 29, 2019
Jun. 30, 2019
Dec. 31, 2018
Nov. 05, 2018
Stockholders Equity Note [Line Items]        
Preferred stock, par value (in dollars per share)   $ 0.01 $ 0.01  
Preferred stock, aggregate stated value   $ 0 $ 0  
Series D Preferred Shares [Member]        
Stockholders Equity Note [Line Items]        
Preferred stock, par value (in dollars per share)       $ 0.01
Preferred stock, aggregate stated value $ 1,160,000      
Proceeds from exchange of senior secured promissory note $ 400,000