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STOCK AWARD PLANS - Additional Information (Details) - USD ($) |  | 6 Months Ended
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May 09, 2019 | Jun. 30, 2019
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 4,000,000 |
Maximum shares that can be granted under stock plan (shares) |  | 17,041,803
Shares available for stock awards (shares) |  | 5,207,623
Maximum employee contribution to purchase company stock |  | $ 10,000
Discount rate used to determine the purchase price |  | 15.00%
Stock Option |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Stock award, vesting period |  | 5 years
Unrecognized compensation expense |  | $ 48,400,000
Restricted Stock Awards |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Stock award, vesting period |  | 5 years
Unrecognized compensation expense |  | $ 100,200,000
Restricted Stock Awards | Minimum |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Discount on outstanding grants (percent) |  | 15.00%
Restricted Stock Awards | Maximum |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Discount on outstanding grants (percent) |  | 21.00%

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value. + 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 (f)(2)(v) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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