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Long Term Debt - SVB Loan Agreement - Additional Information (Detail) - SVB Loan Agreement - USD ($)
1 Months Ended
Oct. 31, 2018
Oct. 31, 2016
Oct. 19, 2018
Schedule Of Long Term Debt [Line Items]      
Debt instrument variable percentage   5.50%  
Repayment of outstanding loan principal $ 4,700,000    
Debt instrument stated percentage     10.75%
Minimum      
Schedule Of Long Term Debt [Line Items]      
Debt instrument variable percentage   3.50%  
Term Loan A      
Schedule Of Long Term Debt [Line Items]      
Maximum term loan borrowing capacity   $ 6,000,000.0