Annual report pursuant to Section 13 and 15(d)

Related Party Transactions - Additional Information (Detail)

v3.8.0.1
Related Party Transactions - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Dec. 13, 2013
Jan. 31, 2017
Jan. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 22, 2014
Jul. 30, 2013
7.50% Senior Notes, due August 2020                  
Related Party Transaction [Line Items]                  
Debt instrument fixed interest rate       7.50%         7.50%
6.75% Notes                  
Related Party Transaction [Line Items]                  
Debt instrument fixed interest rate       6.75%       6.75%  
Board of Directors Chairman | Robert L. Parker Jr.                  
Related Party Transaction [Line Items]                  
Board of directors, service term 3 years                
Related party transaction, expense             $ 411,188    
Share-based compensation cost           $ 706,082 1,096,687    
Severance costs             2,488,024    
Benefit expenses           14,441 $ 12,876    
Consultant fee       $ 250,000 $ 250,000 250,000      
Employee Relative                  
Related Party Transaction [Line Items]                  
Related party transaction, expense           180,000      
Employee One                  
Related Party Transaction [Line Items]                  
Related party transaction, expense   $ 90,000 $ 90,000            
Employee Two                  
Related Party Transaction [Line Items]                  
Related party transaction, expense   $ 90,000 $ 90,000            
Director | 7.50% Senior Notes, due August 2020                  
Related Party Transaction [Line Items]                  
Notes payable, related parties           550,000      
Director | 6.75% Notes                  
Related Party Transaction [Line Items]                  
Notes payable, related parties           $ 650,000