Equity Method Investments in Real Estate Ventures at Fair Value - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ 1,180	$ (237)	$ 1,168	$ (152)
Comstock Holding Companies, Inc. share of net income			(93)	$ (47)
Investors X
Schedule of Equity Method Investments [Line Items]
Total revenue	3,678		7,198
Direct costs	3,220		6,262
Net income (loss)	458		936
The Hartford
Schedule of Equity Method Investments [Line Items]
Total revenue	2,498		4,058
Direct costs	753		1,152
Other costs	2,339		3,891
Net income (loss)	(594)		(985)
Investors X
Schedule of Equity Method Investments [Line Items]
Comstock Holding Companies, Inc. share of net income	458		936
The Hartford
Schedule of Equity Method Investments [Line Items]
Comstock Holding Companies, Inc. share of net income	$ (15)		$ (25)