Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Borrowing Arrangements - Schedule of Required Future Principal Payments - (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt, net $ 3,100 $ 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 (2,037)  
Total debt, net $ 3,063