Net Loss Per Share - Antidilutive Shares (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	59,642,687	84,391,917	40,841,379
Common and preferred stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	0	22,314,778	3,635,180
Common stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	35,895,960	51,735,883	37,206,199
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	16,146,630	0	0
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	7,600,097	341,256	0
Earnout shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	0	10,000,000	0