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Net Income Per Share - Antidilutive Securities Excluded from Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from earnings per share (in shares) 140 601
Stock options and RSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from earnings per share (in shares) 130 601
Employee stock purchase plan    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from earnings per share (in shares) 10 0