Earnings (Loss) Per Share - Summary of Potential Common Stock Outstanding Excluded from Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive		63,633	102,600	56,480
Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive			18,150	1,023
Options Outstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive		53,078	55,316	55,457
Restricted Stock Unit
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive		10,555	13,913
VGA Contingent Purchase Commitment
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive	[1]		15,221

[1] This refers to VGA’s commitment to purchase 15.2 million shares of Class A Common Stock for $100.0 million subject to certain conditions including the achievement of a specified technical milestone by March 31, 2021. See Note 10 for more information.