Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net loss attributable to common stockholders	$ (151,584)	$ (236,568)	$ (250,460)
Denominator:
Weighted-average common shares outstanding - basic (in shares)	295,164,515	289,057,198	271,421,986
Weighted-average common shares outstanding - diluted (in shares)	295,164,515	289,057,198	271,421,986
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	33,035,000	28,781,000	22,072,000
Options to purchase common stock
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	23,002,000	19,064,000	14,731,000
Unvested restricted stock units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	10,033,000	9,717,000	7,341,000