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Summary of Significant Accounting Policies - Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Anti-dilutive securities excluded from computation (in shares)	2,883,395	2,405,221	2,883,395	2,405,221
Warrants to purchase common stock
Class of Stock [Line Items]
Anti-dilutive securities excluded from computation (in shares)	409,108	426,827	409,108	426,827
Common stock options
Class of Stock [Line Items]
Anti-dilutive securities excluded from computation (in shares)	2,067,057	1,975,250	2,067,057	1,975,250
Restricted stock units
Class of Stock [Line Items]
Anti-dilutive securities excluded from computation (in shares)	403,100	0	403,100	0
Employee stock purchase plan
Class of Stock [Line Items]
Anti-dilutive securities excluded from computation (in shares)	4,130	3,144	4,130	3,144

X

- 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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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+ References

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