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STOCKHOLDERS' EQUITY - Common Stock, Warrants, Conversion of Convertible Notes and Exercise Convertible Note Hedges Narrative (Details)
9 Months Ended 55 Months Ended
Sep. 30, 2021
vote
$ / shares
shares
Sep. 30, 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
2023 Convertible Notes | Convertible Debt              
Class of Stock [Line Items]              
Shares issued upon conversion (in shares) 2,800,000            
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) 5,500,000 14,900,000          
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          
Shares of common stock received due to exercise of note hedges (in shares) 1,300,000            
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, 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, outstanding (in shares) 398,878,883 398,878,883 390,187,079        
Class B              
Class of Stock [Line Items]              
Common stock, number of votes entitled for each share held (in votes) | vote 10            
Common stock, 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, outstanding (in shares) 62,100,770 62,100,770 65,997,697