Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Restricted Stock Activity (Details)

v3.19.2
Stockholders' Equity - Summary of Restricted Stock Activity (Details)
6 Months Ended
Jun. 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 49,892
Vested (17,690)
Forfeited/canceled (6,632)
Unvested restricted stock units/ awards outstanding, Ending balance 84,159 [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 49,892
Vested (22,056)
Forfeited/canceled (7,871)
Unvested restricted stock units/ awards outstanding, Ending balance 87,293 [1]
Unvested and expected to vest restricted stock units/awards outstanding 82,866
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 96.52
Weighted-average grant date fair value per share, Vested | $ / shares 125.95
Weighted-average grant date fair value per share, Forfeited/canceled | $ / shares 89.42
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Ending balance | $ / shares 104.10
Weighted-average grant date fair value per share, Unvested and expected to vest restricted stock units/awards outstanding | $ / shares $ 103.77
Time based restricted stock awards  
Class Of Stock [Line Items]  
Unvested restricted stock units/ awards outstanding, Beginning balance 36,937
Granted 26,778
Vested (8,699)
Forfeited/canceled (7,093)
Unvested restricted stock units/ awards outstanding, Ending balance 47,923 [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 66,944
Vested (24,431)
Forfeited/canceled (16,720)
Unvested restricted stock units/ awards outstanding, Ending balance 110,551 [1]
Unvested and expected to vest restricted stock units/awards outstanding 66,529
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 106.97
Weighted-average grant date fair value per share, Vested | $ / shares 114.89
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 112.23
Weighted-average grant date fair value per share, Unvested and expected to vest restricted stock units/awards outstanding | $ / shares $ 112.65
[1] Outstanding restricted stock units and restricted stock awards are based on the maximum payout of the targeted number of shares.