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Consolidation of Variable Interest Entities - Additional Information (Detail) - USD ($)	1 Months Ended
	Oct. 31, 2017	Aug. 31, 2016	Oct. 31, 2016
Comstock Investors X, L.C. [Member]
Variable Interest Entity [Line Items]
Aggregate capital raise	$ 19,500,000
Cumulative, compounded, preferred return rate		6.00%
Additional capital raised	$ 5,000,000
Warrants issued	50,000
Aggregate fair value	$ 81,000
Comstock Investors X, L.C. [Member] | Class A [Member]
Variable Interest Entity [Line Items]
Number of warrants issued		150,000
Aggregate fair value of warrants for investors		$ 258,000
Comstock Investors X, L.C. [Member] | Private Placement [Member]
Variable Interest Entity [Line Items]
Aggregate capital raise		14,500,000	$ 14,500,000
Comstock Investors X, L.C. [Member] | Subsidiaries [Member] | Private Placement [Member] | Class B [Member]
Variable Interest Entity [Line Items]
Initial aggregate principal amount up to capital raise		$ 5,000,000
Comstock Development Services LC [Member] | Private Placement [Member]
Variable Interest Entity [Line Items]
Aggregate capital raise			$ 9,500,000

X

- Definition

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+ References

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- Definition

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- Definition

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X

- Definition

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+ References

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- Definition

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- Definition

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875

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- Definition

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- Definition

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