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Stockholders' Equity - Preferred Stock Issuances - Additional Information (Details) - USD ($)
Mar. 29, 2019
Mar. 29, 2019
Nov. 06, 2018
Jun. 30, 2019
Dec. 31, 2018
Nov. 05, 2018
Dec. 31, 2017
Stockholders Equity Note [Line Items]              
Preferred stock, par value (in dollars per share)       $ 0.01 $ 0.01   $ 0.01
Preferred stock, aggregate stated value       $ 0 $ 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 $ 1,160,000          
Proceeds from exchange of senior secured promissory note   400,000          
Issuance of senior secured promissory note in exchange of preferred stock 1,560,000 1,560,000          
Series D Preferred Shares [Member] | Securities Purchase Agreement [Member]              
Stockholders Equity Note [Line Items]              
Preferred stock, shares issued     101        
Series D Preferred Shares [Member] | Common Stock [Member]              
Stockholders Equity Note [Line Items]              
Conversion of common shares     1,655,738        
Series D Preferred Shares [Member] | Subsequent Event [Member]              
Stockholders Equity Note [Line Items]              
Preferred stock, aggregate stated value 1,160,000 1,160,000          
Proceeds from exchange of senior secured promissory note 400,000            
Issuance of senior secured promissory note in exchange of preferred stock 1,560,000 1,560,000          
Preferred stock, value outstanding $ 0 $ 0