Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Stockholders' Equity - Stock Option Plan and Restricted Stock Activity (Details)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Stock Options  
Stock Options  
Balance at beginning of period (shares) | shares 1,956,379
Granted (shares) | shares 309,456
Options exercised (shares) | shares (81,301)
Forfeited (shares) | shares 0
Balance at end of period (shares) | shares 2,184,534
Weighted- Average Exercise Price  
Balance at beginning of period (USD per share) | $ / shares $ 77.54
Granted (USD per share) | $ / shares 95.61
Options exercised (USD per share) | $ / shares 11.70
Forfeited (USD per share) | $ / shares 0
Balance at end of period (USD per share) | $ / shares $ 82.55
Restricted Stock Awards  
Restricted Stock Awards  
Nonvested at beginning of period (shares) | shares 147,259
Granted (shares) | shares 94,508
RSUs vested (shares) | shares (43,904)
Forfeited (shares) | shares 0
Nonvested at end of period (shares) | shares 197,863
Weighted- Average Grant Date Fair Value  
Nonvested at beginning of period (USD per share) | $ / shares $ 125.11
Granted (USD per share) | $ / shares 87.25
RSUs vested (USD per share) | $ / shares 123.28
Forfeited (USD per share) | $ / shares 0
Nonvested at end of period (USD per share) | $ / shares $ 107.43