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Stockholders' Equity - Reconciliation of Transactions Under ATM Agreement (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Net proceeds | $ 1,185,452 | $ 340,088 |  |
ATM Agreement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares sold (in shares) | 4,679,904 |  | 9,464,764 |
Gross proceeds | $ 1,385,452 |  | $ 7,346,707 |
Fees | 252,568 |  | 278,919 |
Net proceeds | $ 1,132,884 |  | $ 7,067,788 |
Average price per share (in dollars per share) | $ 0.30 |  |  | $ 0.78

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