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STOCK-BASED COMPENSATION - SUMMARY OF EQUITY INCENTIVE PROGRAM (Details) - shares shares in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock shares available for grant (in shares) | 3,271 |
Standard and market condition-based stock options outstanding (in shares) | 521 |
Non-option equity instruments outstanding (in shares) |  | 802
Time-based stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Standard and market condition-based stock options outstanding (in shares) | 521 | 828
PSUs outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Non-option equity instruments outstanding (in shares) | 250 |
RSUs outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Non-option equity instruments outstanding (in shares) | 565 |
RSAs outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Non-option equity instruments outstanding (in shares) | 130 | 130

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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- 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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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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