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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% |

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