Stock-Based Compensation - RSU Activity (Details) - Unvested restricted stock units - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of RSUs
Beginning balance (in shares)	12,392
Granted period (in shares)	28,703
Vested (in shares)	(13,531)
Cancelled and forfeited (in shares)	(7,427)
Ending balance (in shares)	20,137	12,392
Weighted average grant date fair value per share
Beginning balance (in dollars per share)	$ 3.02
Granted (in dollars per share)	1.19
Vested (in dollars per share)	2.48
Cancelled and forfeited (in dollars per share)	1.57
Ending balance (in dollars per share)	$ 1.30	$ 3.02
Unrecognized compensation expense	$ 24.6
Unrecognized compensation expense, period of recognition (in years)	2 years 8 months 12 days
Vesting period (in years)	1 year
Fair value vested	$ 33.6	$ 57.1