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Leases - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
City
Jan. 01, 2019
USD ($)
Operating Leased Assets [Line Items]      
Right-of-use asset $ 145,000 $ 145,000 $ 200,000
Weighted-average remaining lease term 2 years 2 years  
Weighted-average discount rate 6.75% 6.75%  
Maximum      
Operating Leased Assets [Line Items]      
Operating lease costs $ 50,000 $ 50,000  
M&I Brazil      
Operating Leased Assets [Line Items]      
Number of cities in which offices and facilities were leased | City   3  
Lease expiration year month   2022-01