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Stock Plans and Stock-Based Compensation - Schedule of Assumptions Used in Determining Fair Value of Shares Issuable (Parenthetical) (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
2016 Employee Stock Purchase Plan    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Dividend rate 0.00% 0.00%