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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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