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Loan and Security Agreement - Additional information (Details) - Loan and Security Agreement [Member] - Silicon Valley Bank [Member] - USD ($)
9 Months Ended
Jan. 05, 2018
Sep. 30, 2019
May 31, 2018
Debt Instrument, Face Amount $ 10,000,000    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   6.00%  
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid $ 650,000    
Cash Collateral for Borrowed Securities     $ 5,000,000
Debt Instrument Basis Spread On Interest Rate On Debt Default 5.00%    
Debt Instrument, Minimum Amount considered for Insolvency   $ 100,000