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Warrants - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2017	Dec. 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 exercise date		Mar. 14, 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 exercise date		Dec. 12, 2023
Class A [Member] | Comstock Investors X, L.C. [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable	50	150	150
Trading days preceding the issuance of warrant		20 days
Warrant exercise date	Oct. 16, 2027	Aug. 15, 2026
Class A [Member] | Maximum [Member] | Comstock Growth Fund [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		76
Warrant exercise price		$ 7.63
Warrant exercise period from date of issuance		10 years
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] | BridgeCom [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		143
Class A [Member] | Maximum [Member] | Comstock Investors VII, L.C [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		16
Class A [Member] | Maximum [Member] | Comstock Investors VIII, L.C [Member]
Class of Stock [Line Items]
Common stock and warrants exercisable		15
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

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-Topic 235
-SubTopic 10
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