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Debt - Summary of Notes Payable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Secured financing, net of deferred financing charges $ 804 $ 922
Notes payable- due to affiliates, unsecured, net of $0.8 million and $0.8 million discount and unamortized deferred financing charges, respectively 4,984 4,903
Unsecured financing, net of deferred financing charges 595 595
Total $ 6,383 $ 6,420