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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | May 31, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 3,281,088 | $ 3,191,152 | $ 9,505,244 | $ 9,818,767 |  |
Preferred stock extend redemption date |  |  |  |  |  |  | Aug. 01, 2018 |  |
Preferred stock redemption extension fee paid |  |  |  |  |  |  | $ 153,500 |  |
Preferred stock redemption extension additional fee paid | $ 153,500 |  |  |  |  |  |  |  |
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 |  | 30,700 | 35,000
Preferred stock, par or stated value (in dollars per share) |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
Liquidation preference per share (in dollars per share) |  |  |  | $ 1,000 |  | $ 1,000 |  | $ 1,000 |
Financial Instruments Subject to Mandatory Redemption, Return On Funds Invested |  |  |  | 14.00% |  | 14.00% |  |  |
Deferred financing costs |  |  |  | $ 3,100,000 |  | $ 3,100,000 |  |  |
Interest expense |  |  |  | 47,000 |  | 86,000 |  |  |
Total unamortized deferred costs |  |  |  | $ 105,000 |  | $ 105,000 |  | $ 115,000 |
Number of shares redeemed |  | 1,000 | 1,000 |  |  |  |  |  |
Number of shares redeemed, value |  |  |  |  |  |  |  | $ 2,000,000 |
Preferred stock shares outstanding (in shares) |  |  |  | 30,700 |  | 30,700 |  | 30,700 |

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