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Common Stock Reserved for Future Issuance (Details) - shares | Sep. 30, 2019 | Dec. 31, 2018
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Common Stock Reserved for Future Issuance |  |
Shares reserved for future issuance (in shares) | 7,617,536 | 5,589,766
Common stock warrants |  |
Common Stock Reserved for Future Issuance |  |
Shares reserved for future issuance (in shares) | 6,193,749 | 4,202,449
Common stock options outstanding |  |
Common Stock Reserved for Future Issuance |  |
Shares reserved for future issuance (in shares) | 843,183 | 433,389
Common stock options available for future issuance |  |
Common Stock Reserved for Future Issuance |  |
Shares reserved for future issuance (in shares) | 468,123 | 877,917
Employee stock purchase plan |  |
Common Stock Reserved for Future Issuance |  |
Shares reserved for future issuance (in shares) | 112,481 | 76,011

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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