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Employee Stock Plans - 2009 Stock Plan (Details) - 2009 Plan - shares
Apr. 26, 2017
Apr. 23, 2015
Oct. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares of common stock reserved for issuance (in shares) 1,500,000 2,500,000  
Shares reserved for issuance     12,000,000