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Warrants - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2017	Mar. 31, 2018	Aug. 31, 2016
Comstock Investors X, L.C. [Member]
Class of Stock [Line Items]
Additional capital raised	$ 5,000
Class A [Member] | BridgeCom [Member]
Class of Stock [Line Items]
Warrant exercise date		Jul. 12, 2021
Warrant exercise price		$ 7.21
Class A [Member] | Comstock Investors VII, L.C [Member]
Class of Stock [Line Items]
Initial investment amount		$ 250
Trading days preceding the issuance of warrant		20 days
Warrant expiration date		Mar. 14, 2023
Warrant expiration date		Apr. 05, 2023
Class A [Member] | Comstock Investors VIII, L.C [Member]
Class of Stock [Line Items]
Initial investment amount		$ 250
Trading days preceding the issuance of warrant		20 days
Warrant expiration date		Dec. 12, 2023
Warrant expiration date		Dec. 17, 2023
Class A [Member] | Comstock Investors X, L.C. [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable	50,000	150,000	150,000
Warrant exercise date	Oct. 13, 2027	Aug. 15, 2026
Trading days preceding the issuance of warrant		20 days
Class A [Member] | Maximum [Member] | BridgeCom [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		142,857
Class A [Member] | Maximum [Member] | Comstock Growth Fund [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		76,244
Warrant expiration date		Nov. 12, 2024
Warrant expiration date		May 12, 2025
Warrant exercise period from date of issuance		10 years
Warrant exercise price		$ 7.63
Class A [Member] | Maximum [Member] | Comstock Growth Fund [Member] | Affiliates and Insiders [Member]
Class of Stock [Line Items]
Warrant exercise price		$ 7.63
Class A [Member] | Maximum [Member] | Comstock Investors VII, L.C [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		16,572
Warrant exercise date		Apr. 05, 2023
Class A [Member] | Maximum [Member] | Comstock Investors VIII, L.C [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		14,573
Warrant exercise date		Dec. 17, 2023
Class A [Member] | Minimum [Member] | Comstock Growth Fund [Member]
Class of Stock [Line Items]
Warrant exercise price		$ 4.91
Class A [Member] | Minimum [Member] | Comstock Growth Fund [Member] | Affiliates and Insiders [Member]
Class of Stock [Line Items]
Warrant exercise price		$ 7.30
Class A [Member] | Minimum [Member] | Comstock Investors VII, L.C [Member]
Class of Stock [Line Items]
Warrant exercise date		Mar. 14, 2023
Class A [Member] | Minimum [Member] | Comstock Investors VIII, L.C [Member]
Class of Stock [Line Items]
Warrant exercise date		Dec. 12, 2023

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
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