Basic and Diluted Net Loss per Share - Computation of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss attributable to common stockholders	$ (9,153)	$ (51,404)	$ (981)	$ (6,033)	$ (60,557)	$ (7,014)
Denominator:
Weighted average shares outstanding, basic (in shares)	191,922,517		35,331,373		172,631,312	34,968,882
Weighted average shares outstanding, diluted (in shares)	191,922,517		35,331,373		172,631,312	34,968,882
Basic net loss per share (in dollars per share)	$ (0.05)		$ (0.03)		$ (0.35)	$ (0.20)
Diluted net loss per share (in dollars per share)	$ (0.05)		$ (0.03)		$ (0.35)	$ (0.20)
Common Class A
Numerator:
Net loss attributable to common stockholders	$ (8,753)		$ (788)		$ (57,927)	$ (5,635)
Denominator:
Weighted average shares outstanding, basic (in shares)	183,544,894		28,390,021		165,133,108	28,027,530
Weighted average shares outstanding, diluted (in shares)	183,544,894		28,390,021		165,133,108	28,027,530
Basic net loss per share (in dollars per share)	$ (0.05)		$ (0.03)		$ (0.35)	$ (0.20)
Diluted net loss per share (in dollars per share)	$ (0.05)		$ (0.03)		$ (0.35)	$ (0.20)
Common Class V
Numerator:
Net loss attributable to common stockholders	$ (400)				$ (2,630)
Denominator:
Weighted average shares outstanding, basic (in shares)	8,377,623				7,498,204
Weighted average shares outstanding, diluted (in shares)	8,377,623				7,498,204
Basic net loss per share (in dollars per share)	$ (0.05)				$ (0.35)
Diluted net loss per share (in dollars per share)	$ (0.05)				$ (0.35)
Common Class F
Numerator:
Net loss attributable to common stockholders			$ (193)			$ (1,379)
Denominator:
Weighted average shares outstanding, basic (in shares)			6,941,352			6,941,352
Weighted average shares outstanding, diluted (in shares)			6,941,352			6,941,352
Basic net loss per share (in dollars per share)			$ (0.03)			$ (0.20)
Diluted net loss per share (in dollars per share)			$ (0.03)			$ (0.20)