Quarterly report pursuant to Section 13 or 15(d)

Borrowing Arrangements - Schedule of Required Future Principal Payments - (Detail)

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Borrowing Arrangements - Schedule of Required Future Principal Payments - (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total debt, net $ 4,100,000 $ 5,600,000
Growth Capital Loan    
Debt Instrument [Line Items]    
2017 600,000  
2018 2,400,000  
2019 1,145,000  
Total debt 4,145,000 $ 5,600,000
Debt discount and deferred finance costs (63,000)  
Total debt, net $ 4,082,000