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Stockholders' Equity - Summary of Restricted Stock Activity (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Time based restricted stock units  
Class Of Stock [Line Items]  
Unvested restricted stock units/ awards outstanding, Beginning balance 58,589
Granted 80,450
Vested (21,257)
Forfeited/canceled (10,935)
Unvested restricted stock units/ awards outstanding, Ending balance 106,847 [1]
Performance and time based restricted stock units  
Class Of Stock [Line Items]  
Unvested restricted stock units/ awards outstanding, Beginning balance 8,739
Vested (4,366)
Forfeited/canceled (1,239)
Unvested restricted stock units/ awards outstanding, Ending balance 3,134 [1]
Restricted stock units  
Class Of Stock [Line Items]  
Unvested restricted stock units/ awards outstanding, Beginning balance 67,328
Granted 80,450
Vested (25,623)
Forfeited/canceled (12,174)
Unvested restricted stock units/ awards outstanding, Ending balance 109,981 [1]
Unvested and expected to vest restricted stock units/awards outstanding 101,117
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Beginning balance | $ / shares $ 115.16
Weighted-average grant date fair value per share, Granted | $ / shares 76.16
Weighted-average grant date fair value per share, Vested | $ / shares 125.04
Weighted-average grant date fair value per share, Forfeited/canceled | $ / shares 100.36
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Ending balance | $ / shares 85.97
Weighted-average grant date fair value per share, Unvested and expected to vest restricted stock units/awards outstanding | $ / shares $ 85.75
Time based restricted stock awards  
Class Of Stock [Line Items]  
Unvested restricted stock units/ awards outstanding, Beginning balance 36,937
Granted 51,234
Vested (10,986)
Forfeited/canceled (7,093)
Unvested restricted stock units/ awards outstanding, Ending balance 70,092 [1]
Performance and time based restricted stock awards  
Class Of Stock [Line Items]  
Unvested restricted stock units/ awards outstanding, Beginning balance 47,821
Granted 40,166
Vested (15,732)
Forfeited/canceled (9,627)
Unvested restricted stock units/ awards outstanding, Ending balance 62,628 [1]
Restricted stock awards  
Class Of Stock [Line Items]  
Unvested restricted stock units/ awards outstanding, Beginning balance 84,758
Granted 91,400
Vested (26,718)
Forfeited/canceled (16,720)
Unvested restricted stock units/ awards outstanding, Ending balance 132,720 [1]
Unvested and expected to vest restricted stock units/awards outstanding 78,627
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Beginning balance | $ / shares $ 115.80
Weighted-average grant date fair value per share, Granted | $ / shares 86.89
Weighted-average grant date fair value per share, Vested | $ / shares 114.17
Weighted-average grant date fair value per share, Forfeited/canceled | $ / shares 109.11
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Ending balance | $ / shares 97.34
Weighted-average grant date fair value per share, Unvested and expected to vest restricted stock units/awards outstanding | $ / shares $ 92.43
[1] Outstanding restricted stock units and restricted stock awards are based on the maximum payout of the targeted number of shares.