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Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Customer
Segment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Line Items]          
Number of customers with supply agreements | Customer     4    
Agreements expiring period     2016    
Agreements expiring period     2020    
Rail car revenue recognized $ 1,395,000 $ 865,000 $ 4,337,000 $ 2,521,000  
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
Accounts receivables due period     30 days    
Accounts receivables, allowance for doubtful accounts 189,000   $ 189,000   0
Deferred revenue balance 5,204,000   5,204,000   $ 7,133,000
Revenue generated from shipping 0 0 121,000 2,294,000  
Cost of goods sold generated from shipping 0 0 157,000 2,257,000  
Inventory write-down 0 0 0 0  
Fees attributable to lender 1,664,000   1,664,000    
Amortization of deferred financing cost 37,000 37,000 117,000 107,000  
Accretion expense of debt discount 73,000 73,000 232,000 217,000  
Accelerated amortization of debt issuance costs     18,000    
Recognized income tax interest and penalties     0    
Probable environmental matters 0 0 $ 0 0  
Number of operating segment | Segment     1    
Take-or-pay Contracts [Member]          
Significant Accounting Policies [Line Items]          
Revenue recognized relating to minimum required payments $ 0 $ 0 $ 2,997,000 $ 0