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STOCK-BASED COMPENSATION. (Details) | Dec. 31, 2019 shares
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Stock compensation plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares of common stock authorized for issuance (in shares) | 36,377,502
Employee stock purchase |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares of common stock authorized for issuance (in shares) | 1,964,676

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