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Stockholders’ Equity - RSU and PSU award activity (Details) - $ / shares
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Shares Available For Grant            
Shares Available for Grant Beginning Balance (in shares)     769,202      
Additional authorization (in shares)     1,000,000      
Shares Available for Grant Ending Balance (in shares)     545,751 769,202    
Shares Subject to Outstanding Options, Shares            
Outstanding at the beginning of the period (in shares)     1,178,660      
Outstanding at the end of the period (in shares)     2,043,337 1,178,660    
Shares Subject to Outstanding Options, Weighted Average Exercise Price            
Outstanding at the beginning of the period (in dollars per share)     $ 98.88      
Outstanding at the end of the period (in dollars per share)     $ 80.35 $ 98.88    
Restricted Stock Units (RSUs)            
Shares Available For Grant            
Granted (in shares)     (898,598)      
Cancelled (in shares)     120,591      
Shares Subject to Outstanding Options, Shares            
Granted (in shares)   190,000 898,598      
Cancelled (in shares)     (120,591)      
Released (in shares)     (358,774)      
Shares Subject to Outstanding Options, Weighted Average Exercise Price            
Granted (in dollars per share)     $ 70.39      
Cancelled (in dollars per share)     95.33      
Released (in dollars per share)     $ 93.64      
Performance Stock Units (PSUs)            
Shares Available For Grant            
Granted (in shares)     (523,743)      
Cancelled (in shares)     78,299      
Shares Subject to Outstanding Options, Shares            
Granted (in shares) 77,243 446,500 523,743 0 0 55,326
Cancelled (in shares)     (78,299)      
Shares Subject to Outstanding Options, Weighted Average Exercise Price            
Granted (in dollars per share)     $ 66.18      
Cancelled (in dollars per share)     $ 66.44