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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |
Short-term investment maturity period |  |  | 3 months |  |
Restricted cash | $ 10,135 |  | $ 10,135 |  | $ 10,135
Weighted average number of common shares outstanding | 9,224,318 | 8,466,909 | 9,223,264 | 8,466,909 |
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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