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Mandatorily Redeemable Series A Preferred Stock - Additional Information (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2012
USD ($)
shares
Sep. 30, 2011
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Director
shares
Sep. 30, 2015
USD ($)
shares
Nov. 09, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Jul. 01, 2013
shares
Sep. 13, 2011
shares
Class Of Stock [Line Items]                    
Common stock, shares issued | shares     22,229,570   22,229,570     22,139,480    
Interest expense incurred         $ 4,936,000 $ 3,690,000        
Redeemable Series A preferred stock     $ 39,700,000   39,700,000     $ 34,708,000    
Series A Preferred Stock                    
Class Of Stock [Line Items]                    
Preferred stock, liquidation value     39,700,000   $ 39,700,000          
Series A Preferred Stock | Subsequent Event                    
Class Of Stock [Line Items]                    
Redeemable Series A preferred stock             $ 40,329,000      
Mandatorily Redeemable Series A Preferred Stock                    
Class Of Stock [Line Items]                    
Preferred stock, shares authorized | shares                 100,000 200,000
Preferred stock, voting rights description         The holders of the shares of Series A Preferred Stock were not entitled to vote, but were entitled to elect four of the seven directors to the Board.          
Number of directors entitled to be elected | Director         4          
Number of directors | Director         7          
Preferred stock, dividend rate per annum         15.00%          
Preferred shares issued for dividends | shares         4,148 3,581        
Interest expense incurred     $ 1,813,000 $ 1,256,000 $ 4,936,000 $ 3,690,000        
Interest expense capitalized to property, plant and equipment         $ 59,000 $ 463,000        
Mandatorily redeemable preferred shares date         Sep. 13, 2016          
Mandatorily Redeemable Series A Preferred Stock | Minimum                    
Class Of Stock [Line Items]                    
Options to repay of preferred shares amount         $ 1,000,000          
Mandatorily Redeemable Series A Preferred Stock | Installment One                    
Class Of Stock [Line Items]                    
Preferred Stock, Dividend Payment Terms         Dividends accrued and accumulated on the Series A Preferred Stock, whether or not earned or declared, at the rate of 15% per annum and compound quarterly on April 1, July 1, October 1 and January 1.          
Mandatorily Redeemable Series A Preferred Stock | Tranche One                    
Class Of Stock [Line Items]                    
Transaction costs incurred in connection with the issuance of the preferred shares         $ 1,698,000          
Mandatorily Redeemable Series A Preferred Stock | Tranche Two                    
Class Of Stock [Line Items]                    
Transaction costs incurred in connection with the issuance of the preferred shares         $ 1,639,000          
Series A Investor                    
Class Of Stock [Line Items]                    
Date of agreement         Sep. 13, 2011          
Series A Investor | Tranche One                    
Class Of Stock [Line Items]                    
Common stock, shares issued | shares   14,300,000                
Proceeds from issuance of common stock   $ 22,000,000                
Series A Investor | Mandatorily Redeemable Series A Preferred Stock | Tranche One                    
Class Of Stock [Line Items]                    
Preferred stock, shares issued | shares   22,000                
Preferred stock issued, value per share | $ / shares   $ 1,000                
Series A Investor | Mandatorily Redeemable Series A Preferred Stock | Tranche Two                    
Class Of Stock [Line Items]                    
Preferred stock, shares issued | shares 26,000                  
Proceeds from issuance of redeemable preferred stock $ 26,000,000