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Net Loss Per Share Attributable to Common Stockholders - Schedule of Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Diluted net loss per share attributable to common stockholders	335,176,570	323,726,518
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Diluted net loss per share attributable to common stockholders	223,033,725	248,336,668
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Diluted net loss per share attributable to common stockholders	59,603,390	50,414,160
Outstanding RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Diluted net loss per share attributable to common stockholders	50,272,925	23,992,200
Unvested early exercised options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Diluted net loss per share attributable to common stockholders	1,740,600
Unvested common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Diluted net loss per share attributable to common stockholders	525,930	983,490

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

No definition available.

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