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Acquisitions - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) | Aug. 20, 2019 | Jul. 26, 2019 | Sep. 30, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 4,960,000 | $ 0
American Electric |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase price |  | $ 11,088,573 |  |
Current Assets |  | 3,611,000 |  |
Property, plant and equipment, net |  | 532,000 |  |
Investment in foreign joint venture |  | 9,333,000 |  |
Other noncurrent assets |  | 410,000 |  |
Total identifiable assets |  | 13,886,000 |  |
Accounts payable and other accrued expenses |  | (3,221,000) |  |
Accrued liabilities and other current liabilities |  | (138,000) |  |
Accrued liabilities and other current liabilities |  | (84,000) |  |
Total liabilities assumed |  | (3,443,000) |  |
Goodwill |  | $ 646,000 |  |
Diversenergy, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase price | $ 5,000,000 |  |  |
Current Assets | 164,000 |  |  |
Property, plant and equipment, net | 507,000 |  |  |
Other noncurrent assets | 114,000 |  |  |
Total identifiable assets | 785,000 |  |  |
Current liabilities | (99,000) |  |  |
Total liabilities assumed | (99,000) |  |  |
Goodwill | $ 4,314,000 |  |  |

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