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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS - ESPP (Details) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares available for issuance	100,500,000
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares available for issuance	1,000,000
Shares issued under employee stock purchase plan (in shares)	28,621	35,964

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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.

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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 shares issued during the period as a result of an employee stock purchase plan.

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