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Subsequent Events - Minimum Future Rental Payments Under Operating Leases (Detail) - USD ($)
$ in Thousands
Feb. 02, 2018
Dec. 31, 2017
Operating Leased Assets [Line Items]    
2018   $ 147
2019   142
2020   150
2021   157
Total minimum future payments   $ 596
Miami Lakes, Florida [Member] | Subsequent Event [Member]    
Operating Leased Assets [Line Items]    
2018 $ 116  
2019 158  
2020 163  
2021 41  
Total minimum future payments $ 478