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Stockholders' Equity - Summary of MSU Performance (Details) - Market Performance Based Restricted Stock Units
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average period of total unamortized cost (in years) 1 year 7 months 6 days
Number of Shares Underlying MSUs  
Nonvested as of December 31, 2018 | shares 324
Granted | shares 133
Vested and released | shares (179)
Forfeited | shares (5)
Nonvested as of June 30, 2019 | shares 273
Weighted Average Grant Date Fair Value  
Nonvested as of December 31, 2018 | $ / shares $ 215.07
Granted | $ / shares 245.69
Vested and released | $ / shares 72.74
Forfeited | $ / shares 265.42
Nonvested as of June 30, 2019 | $ / shares $ 322.53
Weighted Average Remaining Contractual Term (in years)  
Nonvested as of June 30, 2019 1 year 7 months 6 days
Aggregate Intrinsic Value  
Nonvested as of June 30, 2019 | $ $ 74,615