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, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total $ 3,200 $ 3,300
Long-term debt, net 3,159 $ 3,254
Perceptive Credit Facility    
Debt Instrument [Line Items]    
2019 (remaining) 0  
2020 800  
2021 800  
2022 3,500  
2023 0  
Total 5,100  
Debt discount and deferred finance costs (1,741)  
Total 3,359  
Short-term portion (200)  
Long-term debt, net $ 3,159