STOCKHOLDERS' EQUITY - Common Stock, Warrants, Conversion of Notes and Exercise Convertible Note Hedges Narrative (Details)	3 Months Ended	49 Months Ended
	Mar. 31, 2021 vote $ / shares shares	Mar. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares	Nov. 13, 2020 $ / shares shares	Mar. 05, 2020 $ / shares shares	May 25, 2018 $ / shares shares	Mar. 06, 2017 $ / shares shares
Common Stock Warrant, 2022 Notes
Class of Stock [Line Items]
Warrants to purchase aggregate shares of capital stock (in shares)							19,200,000
Warrants, weighted average exercise price (in USD per share) | $ / shares							$ 31.18
Number of warrants exercised (in shares)	0	0
Shares of common stock received due to exercise of note hedges (in shares)	5,300,000	14,700,000
Common Stock Warrant, 2023 Notes
Class of Stock [Line Items]
Warrants to purchase aggregate shares of capital stock (in shares)						11,100,000
Warrants, weighted average exercise price (in USD per share) | $ / shares						$ 109.26
Number of warrants exercised (in shares)	0	0
Common Stock Warrant, 2025 Notes
Class of Stock [Line Items]
Warrants to purchase aggregate shares of capital stock (in shares)					8,260,000
Warrants, weighted average exercise price (in USD per share) | $ / shares					$ 161.34
Number of warrants exercised (in shares)	0	0
Common Stock Warrant, 2026 Notes
Class of Stock [Line Items]
Warrants to purchase aggregate shares of capital stock (in shares)				1,920,000
Warrants, weighted average exercise price (in USD per share) | $ / shares				$ 368.16
Number of warrants exercised (in shares)	0	0
Common Stock Warrant, 2027 Notes
Class of Stock [Line Items]
Warrants to purchase aggregate shares of capital stock (in shares)				1,920,000
Warrants, weighted average exercise price (in USD per share) | $ / shares				$ 414.18
Number of warrants exercised (in shares)	0	0
Class A
Class of Stock [Line Items]
Common stock, number of votes entitled for each share held (in votes) | vote	1
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000	1,000,000,000
Common stock, par value (in USD per share) | $ / shares	$ 0.0000001	$ 0.0000001	$ 0.0000001
Common stock, shares outstanding (in shares)	390,680,544	390,680,544	390,187,079
Class B
Class of Stock [Line Items]
Common stock, number of votes entitled for each share held (in votes) | vote	10
Common stock, shares authorized (in shares)	500,000,000	500,000,000	500,000,000
Common stock, par value (in USD per share) | $ / shares	$ 0.0000001	$ 0.0000001	$ 0.0000001
Common stock, shares outstanding (in shares)	63,987,897	63,987,897	65,997,697