Basic and Diluted Net Loss per Common Share (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2022 $ / shares
Numerator:
Net loss attributable to common stockholders | $	$ (62,157)	$ (51,225)	$ (147,417)	$ (116,889)
Denominator:
Weighted average common shares outstanding - basic (in shares)	291,970,562	266,398,516	288,646,587	265,384,865
Weighted average number of shares outstanding - diluted (in shares)	291,970,562	266,398,516	288,646,587	265,384,865
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			29,449,000	22,832,000
Private Placement
Denominator:
Warrants exercise price (in dollars per share) | $ / shares					$ 0.01
Options to purchase common stock
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			19,283,000	14,962,000
Unvested restricted stock units
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			10,166,000	7,412,000
Convertible notes
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			0	458,000