Annual report pursuant to Section 13 and 15(d)

Related Party Transactions - Additional Information (Detail)

v3.7.0.1
Related Party Transactions - Additional Information (Detail)
1 Months Ended 12 Months Ended
Jan. 26, 2017
USD ($)
Jan. 05, 2017
USD ($)
ExecutiveOfficers
Nov. 30, 2016
USD ($)
May 12, 2016
shares
Apr. 01, 2016
USD ($)
Feb. 28, 2017
USD ($)
Jul. 31, 2016
Aug. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
May 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Related Party Transaction [Line Items]                            
Guaranteed borrowing capacity                 $ 7,000,000         $ 5,000,000
Line of credit facility sub limit additional borrowing capacity                         $ 2,000,000  
Notes payable                 14,400,000 $ 12,800,000        
Notes payable, current                 $ 2,360,000 10,360,000        
Restricted Stock                            
Related Party Transaction [Line Items]                            
Stock awards vesting periods                 3 years          
TNT                            
Related Party Transaction [Line Items]                            
Notes payable                       $ 2,000,000    
TNT | Irrevocable Letter of Credit                            
Related Party Transaction [Line Items]                            
Notes payable                       $ 1,000,000    
Energy Source                            
Related Party Transaction [Line Items]                            
Accrued interest                 $ 300,000 200,000        
Interest Expenses                 600,000 200,000        
Aston Capital Limited Liability Company                            
Related Party Transaction [Line Items]                            
Bridge loan, amount     $ 1,500,000                      
Annual payment for underlying lease                 300,000 300,000 $ 300,000      
Aston Capital Limited Liability Company | Bridge Loan                            
Related Party Transaction [Line Items]                            
Interest rate of debt     9.00%                      
Aston Capital Limited Liability Company | Restricted Stock                            
Related Party Transaction [Line Items]                            
Number of shares authorized for grant | shares       250,000                    
Stock awards vesting periods       3 years                    
Promissory notes | Energy Source                            
Related Party Transaction [Line Items]                            
Notes payable, current               $ 10,000,000            
Debt instrument maturity date             Jan. 20, 2017 Jul. 20, 2016            
Amended and Restated Promissory Note | Aston Capital Limited Liability Company                            
Related Party Transaction [Line Items]                            
Debt instrument maturity date         Apr. 01, 2019                  
Accrued interest                 200,000 400,000        
Interest Expenses                 $ 200,000 $ 200,000 $ 800,000      
Debt instrument amount         $ 2,600,000                  
Interest rate of debt         9.00%                  
Subsequent Event                            
Related Party Transaction [Line Items]                            
Guaranteed borrowing capacity $ 7,000,000                          
Subsequent Event | TNT                            
Related Party Transaction [Line Items]                            
Debt instrument maturity date           Nov. 06, 2017                
Subsequent Event | TNT | Irrevocable Letter of Credit                            
Related Party Transaction [Line Items]                            
Notes payable           $ 1,000,000                
Subsequent Event | Aston Capital Limited Liability Company                            
Related Party Transaction [Line Items]                            
Number of new executives | ExecutiveOfficers   2                        
Executive compensation cost   $ 0                        
Subsequent Event | Aston Capital Limited Liability Company | Bridge Loan                            
Related Party Transaction [Line Items]                            
Repayment of debt $ 1,500,000