Equity Incentive Plans - Stock Options (Details)	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Number of Shares
Options outstanding balance, beginning (shares) | shares	10,417,000
Options granted (shares) | shares	3,535,000
Options exercised (shares) | shares	0
Options forfeited (shares) | shares	(1,006,000)
Options outstanding balance, ending (shares) | shares	12,946,000
Options exercisable (shares) | shares	6,476,000
Weighted-Average Exercise Price per Share
Options outstanding balance, beginning (in dollars per share) | $ / shares	$ 7.00
Options granted (in dollars per share) | $ / shares	0.98
Options exercised (in dollars per share) | $ / shares	0
Options forfeited (in dollars per share) | $ / shares	7.18
Options outstanding balance, ending (in dollars per share) | $ / shares	5.34
Options exercisable (in dollars per share) | $ / shares	$ 7.16