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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 29, 2017 | Jun. 30, 2016 | Feb. 28, 2018 | Aug. 31, 2017 | Apr. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  | 298,525 |  |  |  |
Proceeds from the issuance of common stock |  |  |  |  |  | $ 1,795,860 | $ 2,920,253 |
Leviston |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 615,605 |  | 777,936 |  |  |
Value of shares issued |  |  | $ 200,000 |  | $ 200,000 |  |  |
ATM Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  | 6,429,299 |  | 3,292,161.4
Proceeds from the issuance of common stock | $ 250,000 |  |  |  |  | $ 1,743,018 |  | $ 2,595,432
ATM Agreement | International Assets Advisory LLC |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering price, up to |  | $ 5,000,000 |  |  |  |  |  |
Commission paid (as a percent) |  | 2.50% |  |  |  |  |  |
ATM Agreement | Leviston |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering price, up to |  |  |  |  | $ 7,250,000.00 |  |  |

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