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Net Loss Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Potential Dilutive Outstanding Securities Excluded From Diluted Net Loss Per Common Share | The following potentially dilutive outstanding securities were excluded from diluted net loss per common share for the period indicated because of their anti-dilutive effect:
Potentially dilutive securities |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Stock options |  | 2,190,360 |  |  | 547,571 |  |  | 2,190,360 |  |  | 547,571 |
Warrants |  | 3,750,833 |  |  | 3,751,002 |  |  | 3,750,833 |  |  | 3,751,002 |
Total |  | 5,941,193 |  |  | 4,298,573 |  |  | 5,941,193 |  |  | 4,298,573 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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