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Mandatorily Redeemable Series A Preferred Stock - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 31, 2017
Feb. 10, 2017
Jan. 31, 2012
Sep. 30, 2011
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Nov. 09, 2016
Class Of Stock [Line Items]                
Common stock, shares issued 40,406,068       40,406,068 38,884,068    
Proceeds from issuance of common stock $ 0 $ 0            
Interest expense incurred             $ 1,500,000  
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   1,000  
Interest expense incurred         $ 0   $ 1,559,000  
Interest expense capitalized to property, plant and equipment         $ 0 $ 132,000    
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