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Stockholders' Equity - Reconciliation of Transactions Under ATM Agreement (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Class of Stock [Line Items] |  |
Net proceeds | $ 813,561 | $ 1,185,452
ATM Agreement |  |
Class of Stock [Line Items] |  |
Issuance of common stock (in shares) | 5,452,000 | 4,679,904
Gross proceeds | $ 813,561 | $ 1,385,452
Fees | 85,093 | 252,568
Net proceeds | $ 728,468 | $ 1,132,884
Average price per share (in dollars per share) | $ 0.15 | $ 0.30

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