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Earnings Per Share - Antidilutive Securities (Details) - shares | 3 Months Ended
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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

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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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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