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Net Loss Per Share - Antidilutive Securities (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 62,739 | 165,752 | 160,171
Outstanding stock options |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 31,675 | 33,750 | 35,209
Early exercised options subject to repurchase |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 1,820 | 162 | 223
Options exercised via promissory note |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 0 | 4,000 | 4,000
Non-plan Co-Founder and Head of Blend options |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 26,057 | 0 | 0
Unvested restricted stock units |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 2,589 | 0 | 0
Common stock warrants |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 598 | 0 | 2,807
Convertible Preferred Stock warrants |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 0 | 5,461 | 6,008
Founders Convertible Preferred Stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 0 | 1,026 | 1,026
Convertible Preferred Stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total antidilutive securities (in shares) | 0 | 121,353 | 110,898

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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=124432515&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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