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Acquisitions - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
Aug. 20, 2019
Jul. 26, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill     $ 4,453,000 $ 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   (2,714,000)    
Accrued liabilities and other current liabilities   (138,000)    
Accrued liabilities and other current liabilities   (84,000)    
Total liabilities assumed   (2,936,000)    
Goodwill   $ 139,000    
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