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Net Loss Per Share - Summary of Calculation of Diluted Shares Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Potentially dilutive shares not included in calculation of diluted shares outstanding	7,853,010	93,497,146	73,920,658
Redeemable Convertible Preferred Stock
Potentially dilutive shares not included in calculation of diluted shares outstanding		83,568,628	66,825,300
Warrants
Potentially dilutive shares not included in calculation of diluted shares outstanding		161,136	161,136
Stock Options
Potentially dilutive shares not included in calculation of diluted shares outstanding	5,617,568	6,110,000	2,961,008
Restricted Stock Awards
Potentially dilutive shares not included in calculation of diluted shares outstanding		3,249,382	3,873,214
Restricted Stock Units
Potentially dilutive shares not included in calculation of diluted shares outstanding	2,235,442	408,000	100,000

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- 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=6371337&loc=d3e3550-109257

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