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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 18, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Segment
Customer
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Customer
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Significant Accounting Policies [Line Items]                
Number of customers with supply agreement | Customer       4   5    
Agreements expiring period       2016        
Agreements expiring period       2020        
Rail car revenue recognized   $ 1,395,000 $ 865,000 $ 4,337,000 $ 2,521,000 $ 3,543,000 $ 1,563,000  
Monthly reservation charges revenue recognized under certain customer contracts   5,000,000 0 10,541,000 0      
Amount related to minimum commitments under customer contracts due or payable   0   $ 0   $ 0 0  
Accounts receivables due period       30 days   30 days    
Accounts receivables, allowance for doubtful accounts   189,000   $ 189,000   $ 0 161,000  
Deferred revenue balance   5,204,000   5,204,000   7,133,000 0  
Revenue generated from shipping   0 0 121,000 2,294,000 2,294,000 3,972,000  
Cost of goods sold generated from shipping   0 0 157,000 2,257,000 2,257,000 4,246,000  
Inventory write-down   0 0 0 0      
Fees attributable to lender   1,664,000   1,664,000   1,664,000    
Amortization of deferred financing cost   37,000 37,000 117,000 107,000 251,000 86,000  
Accretion expense of debt discount   73,000 73,000 232,000 217,000 519,000 183,000  
Accelerated amortization of debt issuance costs $ 324,000     18,000        
Recognized income tax interest and penalties       0        
Probable environmental matters   0   $ 0   0    
Number of operating segment | Segment       1        
Cash exceeding federally insured limits value           250,000    
Impairment of long lived assets             0  
Asset retirement obligation   1,234,000   $ 1,234,000   1,180,000 1,765,000 $ 204,000
Unbilled Revenues                
Significant Accounting Policies [Line Items]                
Deferred revenue           3,875,000 $ 0  
Take-or-pay Contracts [Member]                
Significant Accounting Policies [Line Items]                
Revenue recognized relating to minimum required payments   $ 0 $ 0 $ 2,997,000 $ 0 $ 10,095,000