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Stock-Based Compensation - Summary of Shares of Common Stock Available for Issuance (Parenthetical) (Details)
Jan. 01, 2020
shares
Issuance under 2019 Plan  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Increase in number of reserved shares 1,562,151
ESPP  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Increase in number of reserved shares 312,430