Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Stockholders' Equity - Stock Option Plan and Restricted Stock Activity (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Stock Options  
Stock Options  
Balance at beginning of period (shares) | shares 1,736,304
Granted (shares) | shares 319,334
Options exercised (shares) | shares (111,010)
Forfeited (shares) | shares (5,000)
Balance at end of period (shares) | shares 1,939,628
Weighted- Average Exercise Price  
Balance at beginning of period (USD per share) | $ / shares $ 66.71
Granted (USD per share) | $ / shares 117.07
Options exercised (USD per share) | $ / shares 23.67
Forfeited (USD per share) | $ / shares 136.72
Balance at end of period (USD per share) | $ / shares $ 77.24
Restricted Stock Awards  
Restricted Stock Awards  
Nonvested at beginning of period (shares) | shares 132,273
Granted (shares) | shares 101,404
RSUs vested (shares) | shares (70,166)
Forfeited (shares) | shares (666)
Nonvested at end of period (shares) | shares 162,845
Weighted- Average Grant Date Fair Value  
Nonvested at beginning of period (USD per share) | $ / shares $ 130.63
Granted (USD per share) | $ / shares 113.48
RSUs vested (USD per share) | $ / shares 110.99
Forfeited (USD per share) | $ / shares 134.36
Nonvested at end of period (USD per share) | $ / shares $ 128.40