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Debt - Summary of Notes Payable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Secured financing $ 0 $ 694
Notes payable- due to affiliates, unsecured, net of $27 thousand discount and unamortized deferred financing charges as of December 31, 2019 5,519 5,706
Unsecured financing 632 595
Total notes payable $ 6,151 6,995
Notes Payable to Affiliates    
Debt Instrument [Line Items]    
Notes payable, discount and unamortized deferred financing charges   $ 27