Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Stock Option Plan and Restricted Stock Activity (Details)

v3.19.2
Stockholders' Equity - Stock Option Plan and Restricted Stock Activity (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Stock Options  
Stock Options  
Balance at beginning of period (shares) | shares 1,736,304
Granted (shares) | shares 311,884
Options exercised (shares) | shares (104,249)
Balance at end of period (shares) | shares 1,943,939
Weighted- Average Exercise Price  
Balance at beginning of period (USD per share) | $ / shares $ 66.71
Granted (USD per share) | $ / shares 117.63
Options exercised (USD per share) | $ / shares 23.16
Balance at end of period (USD per share) | $ / shares $ 77.17
Restricted Stock Awards  
Restricted Stock Awards  
Nonvested at beginning of period (shares) | shares 132,273
Granted (shares) | shares 98,404
RSUs vested (shares) | shares (69,529)
Nonvested at end of period (shares) | shares 161,148
Weighted- Average Grant Date Fair Value  
Nonvested at beginning of period (USD per share) | $ / shares $ 130.63
Granted (USD per share) | $ / shares 114.15
RSUs vested (USD per share) | $ / shares 110.87
Nonvested at end of period (USD per share) | $ / shares $ 129.10