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Outstanding Debt - Additional Information (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 29, 2019
May 23, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 06, 2019
Apr. 30, 2019
Sep. 21, 2018
Debt Instrument [Line Items]              
Interest rate         8.00%    
Debt instrument, principal face amount     $ 10,500,000 $ 4,500,000 $ 2,000,000    
Short Term Notes Payable [Member]              
Debt Instrument [Line Items]              
Debt instrument, principal face amount     $ 9,900,000        
Series D Preferred Shares [Member]              
Debt Instrument [Line Items]              
Interest rate 8.00%            
Preferred stock, stated value $ 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            
Maturity date Apr. 01, 2020            
Senior Secured Notes              
Debt Instrument [Line Items]              
Interest rate   8.00%          
Debt instrument, principal face amount   $ 3,300,000          
Maturity period   6 months          
Senior Secured Convertible Notes              
Debt Instrument [Line Items]              
Interest rate             8.00%
Debt instrument, principal face amount             $ 9,400,000
Debt instrument maturity start date     Dec. 31, 2018 Dec. 31, 2018      
Debt instrument maturity end date     Mar. 31, 2021 Mar. 31, 2021      
8.0% 2018 Notes [Member] | Short Term Notes Payable [Member]              
Debt Instrument [Line Items]              
Interest rate     18.00%        
Debt instrument, principal face amount     $ 5,000,000        
Debt instrument, notice of default description     Company received notices of default from the investors in the 2018 Notes which resulted in a 25%, or $1.1 million, increase in principal and an increase in the interest rates from 8% to 18%.        
Debt instrument, default amount percentage           25.00%  
Debt instrument, default amount           $ 1,100,000  
Increase in interest rate on notes in event of default           18.00%