Related Party Transactions (Details) - Affiliated Entity - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Consulting and Technology Development Agreement
Related Party Transaction [Line Items]
Payments made to related parties		$ 0.0	$ 0.1	$ 0.0	$ 0.4
Share Contribution Agreement | Common stock – Class B
Related Party Transaction [Line Items]
Number of options available for purchase (in shares)	1,233,707
Share Contribution Agreement | Common stock – Class B | Brainyspace, LLC
Related Party Transaction [Line Items]
Number of shares contributed (in shares)	2,467,415