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Equity Incentive Plans - Stock Options (Details)
 6 Months Ended
Jun. 30, 2022
$ / shares
shares
Number of Shares  
Options outstanding balance, beginning (in shares) | shares 10,417,000
Options granted (in shares) | shares 4,773,000
Options exercised (in shares) | shares 0
Options forfeited or canceled (in shares) | shares (1,190,000)
Options outstanding balance, ending (in shares) | shares 14,000,000
Options exercisable (in shares) | shares 7,085,000
Weighted-Average Exercise Price per Share  
Options outstanding balance, beginning (in dollars per share) | $ / shares $ 7.00
Options granted (in dollars per share) | $ / shares 0.88
Options exercised (in dollars per share) | $ / shares 0
Options forfeited (in dollars per share) | $ / shares 7.04
Options outstanding balance, ending (in dollars per share) | $ / shares 4.91
Options exercisable (in dollars per share) | $ / shares $ 6.91