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Earnings Per Share - Antidilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities were excluded from the computation of diluted net income per share attributable to Upstart Holdings, Inc. common stockholders because including them would have been anti-dilutive	1,355,106,000	66,357,412
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities were excluded from the computation of diluted net income per share attributable to Upstart Holdings, Inc. common stockholders because including them would have been anti-dilutive	0	47,349,577
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities were excluded from the computation of diluted net income per share attributable to Upstart Holdings, Inc. common stockholders because including them would have been anti-dilutive	617,424,000	18,087,958
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities were excluded from the computation of diluted net income per share attributable to Upstart Holdings, Inc. common stockholders because including them would have been anti-dilutive	737,682,000	0
Warrants to purchase convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities were excluded from the computation of diluted net income per share attributable to Upstart Holdings, Inc. common stockholders because including them would have been anti-dilutive	0	600,208
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities were excluded from the computation of diluted net income per share attributable to Upstart Holdings, Inc. common stockholders because including them would have been anti-dilutive	0	319,669

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=6371337&loc=d3e3550-109257

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+ References

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