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Stockholders' Equity - Common Stock Shares Reserved (Details) - shares	Sep. 30, 2024	Dec. 31, 2023
Stockholders' Equity
Total (in shares)	55,026,887	49,331,401
Stock-based awards available for grant under 2016 Plan
Stockholders' Equity
Stock-based awards available for grant under 2016 Plan / Shares of Class A common stock reserved for issuance pursuant to ESPP (in shares)	23,045,368	19,869,260
Common Stock Class A
Stockholders' Equity
Class A common stock reserved (in shares)	375,735	442,041
Stock options issued and outstanding
Stockholders' Equity
Stock options issued and outstanding (in shares)	1,392,697	1,722,861
Unvested restricted stock units issued and outstanding
Stockholders' Equity
Unvested restricted stock units issued and outstanding (in shares)	20,265,865	18,755,538
Shares of Class A common stock reserved for issuance pursuant to ESPP
Stockholders' Equity
Stock-based awards available for grant under 2016 Plan / Shares of Class A common stock reserved for issuance pursuant to ESPP (in shares)	9,947,222	8,541,701

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Number of common shares reserved for issuance in relation to a donor-advised fund.

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Aggregate number of common shares reserved for future issuance.

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-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-02(29))
-Publisher FASB
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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