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Acquisitions - Schedule of Summarized Financial Information (Detail) - American Electric - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Revenue	$ 1,371
Loss before income tax expense	(145)
Net loss from continuing operations	$ (145)
Revenue		$ 11,302	$ 9,934	$ 38,543	$ 32,451
Loss from operations		(3,335)	(2,137)	(4,862)	(7,126)
Net loss		$ (3,557)	$ (3,450)	$ (5,846)	$ (10,328)
Loss per common share - basic and diluted (usd per share)		$ (0.24)	$ (0.24)	$ (0.40)	$ (0.71)

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