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Stock-Based Awards - Summary of Activity Under Restricted Stock Units (RSUs) from 2014 Plan (Details) - Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Outstanding, Number of Shares, Unvested, Beginning Balance 1,298,150 954,077 821,560
Number of Shares, granted 967,310 863,065 555,905
Number of Shares, vested (434,153) (313,682) (235,913)
Number of Shares, cancelled (150,140) (205,310) (187,475)
Outstanding, Number of Shares, Unvested, Ending Balance 1,681,167 1,298,150 954,077
Outstanding, Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance $ 61.96 $ 63.12 $ 70.71
Weighted-Average Grant Date Fair Value, granted 64.36 62.78 56.01
Weighted-Average Grant Date Fair Value, vested 62.65 66.25 71.01
Weighted-Average Grant Date Fair Value, cancelled 61.42 64.28 65.37
Outstanding, Weighted-Average Grant Date Fair Value, Unvested, Ending Balance $ 63.21 $ 61.96 $ 63.12