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Debt - Summary of Notes Payable (Detail) - USD ($) $ in Thousands	Sep. 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	5,500	5,706
Unsecured financing	22	595
Total notes payable	$ 5,522	6,995
Notes Payable to Affiliates
Debt Instrument [Line Items]
Notes payable, discount and unamortized deferred financing charges		$ 27

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