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Summary of Financial Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total before discount and debt issuance costs $ 14,863 $ 13,579
Less: Notes payable   (2,000)
Less: Current portion of financial liabilities (14,812) (11,554)
Less: Current portion of unamortized discount and debt issuance costs (51) (25)
Notes Payable    
Debt Instrument [Line Items]    
Total before discount and debt issuance costs   2,000
Revolving Loan Facility    
Debt Instrument [Line Items]    
Total before discount and debt issuance costs $ 14,863 $ 11,579