Fair Value - Level 3 (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Redeemable convertible preferred stock warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance				$ 8,683	$ 7,898	$ 6,684
Additions				1,762
Change in fair value, loss (gain) included in net loss				(785)	785	1,214
Ending balance				9,660	8,683	7,898
FVO notes
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance				6,491	8,257	11,659
Settlements					(2,724)
Change in fair value, loss (gain) included in net loss				(488)	(2,898)	454
Change in fair value, (gain) included in other comprehensive income					3,856	(3,856)
Ending balance				6,003	6,491	8,257
Contingent consideration - earnout
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 47,224	$ 43,193	$ 50,238
Settlements			(25,815)
Change in fair value, loss (gain) included in net loss	(7,413)	4,031	18,770
Ending balance	39,811	47,224	43,193
Contingent consideration - business combination
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,654	2,954	3,549	1,500	20	100
Additions			1,742
Settlements			(2,062)
Change in fair value, loss (gain) included in net loss	195	(300)	(275)	100	1,480	(80)
Ending balance	2,849	2,654	2,954	$ 1,600	$ 1,500	$ 20
Private warrant liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	34,903	47,444	31,534
Settlements	(14,505)	(16,843)
Change in fair value, loss (gain) included in net loss	(2,692)	4,302	15,910
Ending balance	$ 17,706	$ 34,903	$ 47,444