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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Jan. 05, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock-based compensation
Stock-based compensation expense		$ 63,600		$ 41,500	$ 283,300	$ 111,100
Noncash stock-based compensation expense					197,180	111,075
Proceeds from stock options exercised					13,400	$ 15,400
Stock Plans
Stock-based compensation
Unrecognized compensation cost		401,600			$ 401,600
Weighted average period for recognition of cost					2 years 9 months 18 days
Thrive
Stock-based compensation
Stock-based compensation expense	$ 166,000
Noncash stock-based compensation expense		$ 4,500			$ 19,000
Accelerated vesting compensation expense	65,000
Thrive | General and Administrative Expense
Stock-based compensation
Stock-based compensation expense	$ 5,200
Accelerated vesting compensation expense			$ 86,200
Option Plan Shares | Thrive
Stock-based compensation
Accelerated vesting (in shares)		34,167			138,163
Restricted Stock Units | Thrive
Stock-based compensation
Accelerated vesting (in shares)		24,865			58,171

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