Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.3.0.814
Related Party Transactions - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 21, 2014
Apr. 09, 2013
Aug. 31, 2015
Aug. 31, 2014
Jun. 30, 2014
Apr. 30, 2014
Feb. 28, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Oct. 31, 2015
Apr. 30, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]                            
Notes payable, current               $ 10,360,000   $ 10,360,000       $ 360,000
Guaranteed borrowing capacity                         $ 5,000,000  
Line of credit facility, maximum borrowing amount       $ 25,000,000                    
Debt instrument maturity date       Aug. 20, 2017                    
Accrued interest               300,000   300,000        
Interest Expenses               100,000   200,000        
Sales to distributor               37,733,000 $ 26,877,000 85,308,000 $ 49,344,000      
Promissory Notes | Energy Source                            
Related Party Transaction [Line Items]                            
Notes payable, current     $ 10,000,000                      
Debt instrument maturity date     Jul. 20, 2016                      
Debt instrument, interest rate     5.00%                      
Subsequent Event                            
Related Party Transaction [Line Items]                            
Line of credit facility, maximum borrowing amount                       $ 30,000,000    
Aston Capital Limited Liability Company                            
Related Party Transaction [Line Items]                            
Debt instrument amount               2,700,000   $ 2,700,000        
Debt instrument maturity date                   Apr. 01, 2017        
Debt instrument principal amount               $ 5,700,000   $ 5,700,000        
Debt instrument, interest rate               9.00%   9.00%        
Monthly payment for underlying lease                   $ 26,000        
Aston Capital Limited Liability Company | February Note                            
Related Party Transaction [Line Items]                            
Debt instrument amount         $ 1,900,000 $ 1,000,000 $ 3,500,000              
Debt instrument maturity date                   Apr. 01, 2015        
Interest rate of debt             9.00%              
Debt instrument converted in to equity         1,600,000                  
Aston Capital Limited Liability Company | Restricted Stock                            
Related Party Transaction [Line Items]                            
Restricted common stock agreed to be issued for services   500,000                        
Restricted common stock agreed to be issued for services, vesting period   3 years                        
Restricted common stock agreed to be issued for services, vesting date   Sep. 25, 2013                        
Number of shares authorized for grant 300,000                          
Stock awards vesting periods 3 years                          
RVL One Limited Liability Company | RVL Note                            
Related Party Transaction [Line Items]                            
Debt instrument amount           $ 10,800,000                
Debt instrument maturity date                   Apr. 01, 2015        
Interest rate of debt           9.00%                
Debt instrument converted in to equity         $ 10,800,000                  
Chief Financial Officer                            
Related Party Transaction [Line Items]                            
Sales to distributor                   $ 100,000