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Debt - Term Loan (Details) - Term Loan - SVB - USD ($)
Jan. 28, 2019
Feb. 28, 2019
Jul. 31, 2018
Debt      
Debt issue costs $ 1,000,000    
Success fee (as a percentage) 3.50%    
Cash security   $ 15,000  
Purchase of additional common stock through warrants     36,000
Debt discount amortized as interest expenses $ 800,000    
Outstanding borrowings $ 8,900,000