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Mandatorily Redeemable Series A Preferred Stock - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Feb. 10, 2017
Jan. 31, 2012
Sep. 30, 2011
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Nov. 09, 2016
Class Of Stock [Line Items]                    
Common stock, shares issued 40,474,085       40,474,085   40,474,085   38,884,068  
Proceeds from issuance of common stock $ 0 $ 0                
Interest expense incurred               $ 4,936,000    
Series A Preferred Stock                    
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, dividend rate per annum             15.00%      
Preferred shares issued for dividends             0 4,148,000    
Interest expense incurred         $ 0 $ 1,813,000 $ 0 $ 4,936,000    
Interest expense capitalized to property, plant and equipment             $ 0   $ 59,000  
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.      
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       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       22,000            
Preferred stock issued, value per share       $ 1,000            
Series A Investor | Mandatorily Redeemable Series A Preferred Stock | Tranche Two                    
Class Of Stock [Line Items]                    
Preferred stock, shares issued     26,000              
Proceeds from issuance of redeemable preferred stock     $ 26,000,000