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Stockholders' Equity - Shares Reserved for Future Issuance (Details) - shares	Dec. 31, 2020	Dec. 31, 2019
Stockholders' Equity
Number of shares reserved for future issuance	9,646,540	7,617,546
Warrants for the purchase of Common Stock
Stockholders' Equity
Number of shares reserved for future issuance	6,193,749	6,193,749
Options outstanding to purchase Common Stock
Stockholders' Equity
Number of shares reserved for future issuance	1,367,667	785,832
Options available for future issuance to purchase Common Stock
Stockholders' Equity
Number of shares reserved for future issuance	1,936,173	525,484
Shares reserved for the employee stock purchase plan
Stockholders' Equity
Number of shares reserved for future issuance	148,951	112,481

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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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