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Summary of Significant Accounting Policies - Net Loss Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Antidilutive common stock equivalents excluded from computation of diluted net loss per share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | 7,036,932 | 4,651,403 | 7,036,932 | 4,651,403
Stock options |  |  |  |
Antidilutive common stock equivalents excluded from computation of diluted net loss per share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | 843,183 | 448,946 | 843,183 | 448,946
Common stock warrants |  |  |  |
Antidilutive common stock equivalents excluded from computation of diluted net loss per share |  |  |  |
Anti-dilutive securities excluded from the calculation of diluted net loss per share (in shares) | 6,193,749 | 4,202,457 | 6,193,749 | 4,202,457

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + 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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