Quarterly report pursuant to Section 13 or 15(d)

Financings - Additional Information (Detail)

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Financings - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2016
Aug. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
May 30, 2016
Dec. 31, 2015
Apr. 30, 2015
Financing Activities and Borrowing Arrangements [Line Items]                  
Line of credit facility, maximum borrowing amount     $ 27,000,000   $ 27,000,000        
Line of credit facility, maturity date         Oct. 04, 2017        
Guaranteed borrowing capacity     7,000,000   $ 7,000,000       $ 5,000,000
Guaranteed additional borrowing capacity     7,000,000   7,000,000        
Revolving credit facility     25,513,000   25,513,000     $ 22,026,000  
Interest Expenses     200,000 $ 200,000 700,000 $ 500,000      
Notes payable, current     11,360,000   11,360,000     10,360,000  
Notes payable     14,500,000   14,500,000     12,800,000  
Energy Source                  
Financing Activities and Borrowing Arrangements [Line Items]                  
Accrued interest     100,000   100,000     $ 200,000  
Interest Expenses     200,000   400,000        
Energy Source | Promissory notes                  
Financing Activities and Borrowing Arrangements [Line Items]                  
Notes payable, current   $ 10,000,000              
Debt instrument, interest rate 7.00% 5.00%              
Debt instrument maturity date   Jul. 20, 2016              
Debt instrument, maturity date 2017-01                
Value Lighting                  
Financing Activities and Borrowing Arrangements [Line Items]                  
Debt refinance amount         $ 3,700,000        
Value Lighting | Debt Instrument Due in Twenty Eighteen November Twenty Two                  
Financing Activities and Borrowing Arrangements [Line Items]                  
Debt instrument maturity date         Nov. 22, 2018        
Lump sum payment     $ 1,400,000   $ 1,400,000        
TNT                  
Financing Activities and Borrowing Arrangements [Line Items]                  
Debt instrument, interest rate             5.00%    
Notes payable             $ 2,000,000    
TNT | Debt Instrument Due in Twenty Seventeen April Twenty First                  
Financing Activities and Borrowing Arrangements [Line Items]                  
Debt instrument maturity date         Apr. 21, 2017        
Notes payable             1,000,000    
TNT | Debt Instrument Due in Twenty Seventeen November Six                  
Financing Activities and Borrowing Arrangements [Line Items]                  
Debt instrument maturity date         Nov. 06, 2017        
Notes payable             $ 1,000,000