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401(k) Plan and ESPP - Employee Stock Purchase Plan (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Oct. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock shares reserved for issuance (in shares) 1,596,323  
Value of rights granted $ 1.1  
Employee stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock shares reserved for issuance (in shares)   1,700,000