STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Awards Granted (Details) - Employees $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) shares
RSUs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
RSUs (in shares) | shares	1,153,000
Total Fair Value | $	$ 75,510
Non-qualified stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options granted (in shares) | shares	2,165,000
Total Fair Value | $	$ 41,260
Common Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Options granted (in shares) | shares	11,000
Total Fair Value | $	$ 800