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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Short-term investment maturity period |  |  |  | 3 months |  |
Restricted cash |  | $ 10,135 |  | $ 10,135 |  | $ 10,010
Capitalized cost of assets held for sale |  | $ 416,329 |  | $ 416,329 |  |
Decrease in indebtedness | $ 650,000 |  |  |  |  |
Weighted average number of common shares outstanding |  | 8,466,909 | 8,388,821 | 8,466,909 | 8,145,689 |
Redeemable preferred stock outstanding |  | 0 |  | 0 |  |
Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property and Equipment, estimated useful life |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property and Equipment, estimated useful life |  |  |  | 30 years |  |

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