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Stock-Based Compensation - Shares Available for Future Grant (Details) - 2014 Plan
12 Months Ended
Dec. 31, 2021
shares
Shares Available For Grant [Roll Forward]  
Balance at the beginning (in shares) 12,790,775
Share pool increase (in shares) 18,803,404
Cancelled (in shares) 202,500
Forfeited (in shares) 1,091,250
Granted (in shares) (18,755,000)
Balance at the ending (in shares) 14,132,929