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Common Stock - Reserved (Details)	Dec. 31, 2020 shares
Class of Stock [Line Items]
Shares reserved for future issuance	8,618,259
2018 ESPP
Class of Stock [Line Items]
Shares reserved for future issuance	795,849
2018 Plan
Class of Stock [Line Items]
Shares reserved for future issuance	1,962,992
Stock options
Class of Stock [Line Items]
Shares reserved for future issuance	3,679,931
Warrant
Class of Stock [Line Items]
Shares reserved for future issuance	2,179,487

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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

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