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Employee Stock Plans - Employee Stock Purchase Plan - Additional Information (Details) - 2009 ESPP - shares
Apr. 22, 2020
Apr. 26, 2017
Apr. 23, 2015
Jun. 28, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares of common stock reserved for issuance (in shares) 300,000 107,143 71,429  
Shares reserved for issuance (in shares)       362,335