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Convertible Notes and Derivative Instrument (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2020
May 16, 2018
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]          
Principal amount       $ 1,597,652  
Proceeds from debt       $ 308,772 $ 220,649
Convertible notes          
Debt Instrument [Line Items]          
Principal amount     $ 502,000    
Proceeds from debt     $ 507,000    
Converted instrument, shares issued (in shares) 171,750,446        
Effective interest rate   16.99%   16.99% 16.99%
Interest expense   $ 24,000   $ 20,000 $ 67,000
Interest expense, excluding amortization   15,000   15,000 42,000
Amortization of debt discount   9,000   5,000 25,000
Convertible debt, equity fair value used to determine conversion       6,300,000  
Change in fair value of derivative instrument   $ 70,000   $ 0 $ 70,000