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STOCK AWARD PLANS - Summary of Total Compensation Expense Recognized in Statements of Operations for Stock-Based Compensation (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 23,771,000 | $ 7,667,000 | $ 68,475,000 | $ 24,509,000
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 5,666,000 | 1,715,000 | 17,931,000 | 5,341,000
Stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 17,539,000 | 5,427,000 | 48,443,000 | 17,149,000
Company expense on ESPP discount |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 566,101 | $ 525,000 | $ 2,101,000 | $ 2,019,000

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