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STOCK BASED COMPENSATION - Narrative (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2020 shares
Additional Disclosures for equity-based plans |
Shares available for grant (in shares) | 2
Stock Options |
Additional Disclosures for equity-based plans |
Vesting period | 4 years
Time-based RSUs and RSAs |
Additional Disclosures for equity-based plans |
Vesting period | 4 years
Time-based RSUs and RSAs | Minimum |
Additional Disclosures for equity-based plans |
Percent of share value | 0.00%
Time-based RSUs and RSAs | Maximum |
Additional Disclosures for equity-based plans |
Percent of share value | 200.00%
Employee Stock |
Additional Disclosures for equity-based plans |
Shares available for grant (in shares) | 4
Common Class A | Stock Options | Maximum |
Additional Disclosures for equity-based plans |
Contractual term | 10 years
Employee Stock Purchase Plan |
Additional Disclosures for equity-based plans |
Stock options granted percentage of fair market value on offering date | 85.00%
Stock options granted percentage of fair market value on purchase date | 85.00%
Share-based Payment Arrangement, Tranche One | Performance-based RSUs and RSAs |
Additional Disclosures for equity-based plans |
Vesting period | 1 year
Amount of shares that are expected to vest (as a percent ) | 50.00%

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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