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Debt - Summary of Notes Payable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Debt Disclosure [Abstract]                
Secured financing $ 694       $ 922      
Short term notes payable - due to affiliates, net of discount 5,706 $ 5,683 $ 5,702 $ 5,734 5,716 $ 5,700 $ 5,721 $ 17,237
Unsecured financing charges 595       595      
Total notes payable, net $ 6,995       $ 7,233