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Acquisition of PEG Partners, LLC - Schedule of consolidated statements of operations includes revenues and net income from PEG (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items] |  |  |  |  |  |  |  |
Net income (loss) | $ (1,037) | $ (560) | $ (3,444) | $ (1,502) | $ (1,597) | $ (4,946) | $ (11,086) | $ 12,068
Net loss attributable to non-controlling interests | 28 |  | (157) |  | 207 | 46 | (42) | (716)
Net loss attributable to parent | $ (1,066) |  | $ (3,287) |  | $ (1,804) | $ (4,991) | (11,044) | 12,784
PEG Partners LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 24,028 | 12,411
Net income (loss) |  |  |  |  |  |  | (209) | (3,582)
Net loss attributable to non-controlling interests |  |  |  |  |  |  | (42) | (716)
Net loss attributable to parent |  |  |  |  |  |  | $ (168) | $ (2,866)

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