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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

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