Fair Value Measurements - Schedule of Changes in Balances of Level 3 Financial Liabilities (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 433,757	$ 1,092,145	$ 408,118
Issuances	0	0	0
Settlements	0	(1,092,145)	0
Transfers in	0	0	0
Transfers out	0	0	0
Total realized losses (gains)	47,374	0	73,013
Ending balance	481,131	0	481,131
Convertible securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	285,166	949,553	251,885
Issuances	0	0	0
Settlements	0	(949,553)	0
Transfers in	0	0	0
Transfers out	0	0	0
Total realized losses (gains)	95,477	0	128,758
Ending balance	380,643	0	380,643
Derivative liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	119,167	44,810	138,561
Issuances	0	0	0
Settlements	0	(44,810)	0
Transfers in	0	0	0
Transfers out	0	0	0
Total realized losses (gains)	(68,081)	0	(87,475)
Ending balance	51,086	0	51,086
Warrants payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	29,424	97,782	17,672
Issuances	0	0	0
Settlements	0	(97,782)	0
Transfers in	0	0	0
Transfers out	0	0	0
Total realized losses (gains)	19,978	0	31,730
Ending balance	$ 49,402	$ 0	$ 49,402