Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Presentation of Operating Lease Liability and Right-of-Use Asset (Detail)

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Commitments and Contingencies - Presentation of Operating Lease Liability and Right-of-Use Asset (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]      
Present value of future minimum lease payments $ 3,322 $ 3,368  
Operating lease liability, current portion 27 23 $ 0
Operating lease liability, long-term portion 3,295 3,345 0
Total operating lease liability 3,322 3,368  
Difference between future minimum lease payments and discounted cash flows 3,486 3,604  
Operating lease right-of-use asset $ 3,317 $ 3,365 $ 0