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Stock Plans and Stock-Based Compensation - Summary of Restricted Stock Units and Related Information (Parenthetical) (Details) - RSUs
9 Months Ended
Sep. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award  
Vested and subject to deferred settlement 140,000
Weighted average remaining contractual term subject to deferred settlement 1 month 6 days