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Stockholders' Equity - Reconciliation of Transactions Under ATM Agreement (Details) - USD ($) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 29, 2017 | Aug. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) |  | 298,525 |  |  |
Net proceeds |  |  | $ 1,795,860 | $ 2,920,253 |
ATM Agreement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) |  |  | 6,429,299 |  | 3,292,161.4
Gross proceeds |  |  | $ 1,795,860 |  | $ 2,670,253
Fees |  |  | 52,842 |  | 74,821
Net proceeds | $ 250,000 |  | $ 1,743,018 |  | $ 2,595,432
Average price per share (in dollars per share) |  |  | $ 0.28 |  | $ 0.81

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