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Stock-Based Compensation - Summary of Stock Options Activity Under 2018 Plan and 2015 Equity Incentive Plan (Details) - 2018 Plan and 2015 Equity Incentive Plan $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Number of Options |  |
Beginning balance | shares | 6,897,276 |
Granted | shares | 1,478,994 |
Exercised | shares | (348,420) |
Forfeited or canceled | shares | (228,118) |
Ending balance | shares | 7,799,732 | 6,897,276
Weighted Average Exercise Price |  |
Beginning balance | $ / shares | $ 24.52 |
Granted | $ / shares | 94.80 |
Exercised | $ / shares | 17.06 |
Forfeited or canceled | $ / shares | 41.86 |
Ending balance | $ / shares | $ 37.62 | $ 24.52
Weighted Average Remaining Contractual Term (in years) |  |
Weighted Average Remaining Contractual Term (in years) | 7 years 8 months 26 days | 8 years 25 days
Aggregate Intrinsic Value |  |
Balance | $ | $ 431,288 | $ 841,704

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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