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 ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Debt Instrument [Line Items]      
Total debt, net $ 3,000   $ 3,500
SVB Growth Capital Loan      
Debt Instrument [Line Items]      
Total debt 0 $ 3,500  
SVB Growth Capital Loan | Perceptive Credit Facility      
Debt Instrument [Line Items]      
2018 (remaining) 0    
2019 0    
2020 800    
2021 800    
2022 3,500    
Total debt 5,100    
Debt discount and deferred finance costs (2,101)    
Total debt, net $ 2,999