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Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Details) - shares | Mar. 31, 2021 | Dec. 31, 2020
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Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total common stock reserved for future issuance | 6,965,246 | 4,195,805
Stock Options Issued and Outstanding |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total common stock reserved for future issuance | 3,946,817 | 2,463,317
Warrants for Common Stock |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total common stock reserved for future issuance | 1,366,141 | 80,428
Awards Available Under 2018 Equity Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total common stock reserved for future issuance | 792,228 | 1,039,531
Employee Stock Purchase Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total common stock reserved for future issuance | 860,060 | 612,529

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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=120391452&loc=d3e13212-122682 + Details
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