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Series B Mandatorily Redeemable Preferred Stock (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
May 31, 2017
Mar. 31, 2017
Aug. 31, 2016
Jul. 31, 2016
Jun. 30, 2016
Aug. 31, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]                          
Interest expense               $ 3,191,152 $ 3,323,740 $ 9,818,767 $ 10,187,983 $ 13,531,337 $ 10,774,660
Total unamortized deferred stock costs                       1,942,000 $ 2,052,000
Preferred stock extend redemption date Aug. 01, 2019                        
Preferred stock redemption extension fee paid $ 153,500                        
Scheduled payments due in 2017                       $ 32,700,000  
Preferred stock, redemption date                       Aug. 01, 2017  
Redeemable Convertible Preferred Stock Series B [Member]                          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]                          
Preferred stock shares issued (in shares)               30,700   30,700   32,700 35,000
Preferred stock, par or stated value (in dollars per share)               $ 0.01   $ 0.01   $ 0.01 $ 0.01
Liquidation preference per share (in dollars per share)               $ 1,000   $ 1,000   $ 1,000 $ 1,000
Financial Instruments Subject to Mandatory Redemption, Return On Funds Invested               14.00%   14.00%   14.00%  
Deferred financing costs               $ 3,100,000   $ 3,100,000   $ 3,100,000  
Interest expense                   507,000 $ 508,000 1,014,000 $ 952,000
Total unamortized deferred stock costs               $ 134,000   134,000   $ 592,000 $ 1,600,000
Number of shares redeemed   1,000 1,000 1,000 1,000 300           2,300  
Number of shares redeemed, value                   $ 2,000,000   $ 2,300,000  
Preferred stock shares outstanding (in shares)               30,700   30,700   32,700 35,000
Proceeds from private placement offering             $ 40,000,000            
Financial Instruments Subject to Mandatory Redemption, Monthly Payout, Percent                       10.00%  
Financial Instruments Subject to Mandatory Redemption, Monthly Percent Accrued                       4.00%