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Summary of Financial Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total before discount and debt issuance costs $ 13,579 $ 13,736
Less: Current portion of notes payable (2,000)  
Less: Current portion of financial liabilities (11,554) (9,829)
Less: Current portion of unamortized discount and debt issuance costs (25) (404)
Less: Long-term portion of unamortized discount and debt issuance costs 0 (582)
Long-term financial liabilities   2,921
Term Loan    
Debt Instrument [Line Items]    
Total before discount and debt issuance costs   5,000
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 $ 11,579 $ 8,736