Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Stockholders' Equity - Stock Option Plan and Restricted Stock Activity (Details)
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Stock Options  
Stock Options  
Balance at beginning of period (shares) | shares 1,956,379
Granted (shares) | shares 458,750
Options exercised (shares) | shares (93,570)
Forfeited (shares) | shares (3,500)
Balance at end of period (shares) | shares 2,318,059
Weighted- Average Exercise Price  
Balance at beginning of period (USD per share) | $ / shares $ 77.54
Granted (USD per share) | $ / shares 89.43
Options exercised (USD per share) | $ / shares 19.19
Forfeited (USD per share) | $ / shares 68.28
Balance at end of period (USD per share) | $ / shares $ 82.26
Restricted Stock Awards  
Restricted Stock Awards  
Nonvested at beginning of period (shares) | shares 147,259
Granted (shares) | shares 101,156
RSUs vested (shares) | shares (49,749)
Forfeited (shares) | shares 0
Nonvested at end of period (shares) | shares 198,666
Weighted- Average Grant Date Fair Value  
Nonvested at beginning of period (USD per share) | $ / shares $ 125.11
Granted (USD per share) | $ / shares 89.25
RSUs vested (USD per share) | $ / shares 122.14
Forfeited (USD per share) | $ / shares 0
Nonvested at end of period (USD per share) | $ / shares $ 107.59