Stockholder's Equity (Tables)

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Share Grants Activity

The following table represents the share grants activity for the six months ended June 30, 2020: 

	Restricted stock				Options
	Number of shares		Weighted average grant date fair value		Number of shares		Weighted average grant date fair value
Share grants outstanding as of December 31, 2019	534,331		$	71.01	98,756		$	40.71
Granted	135,090		123.10		—		—
Vested or exercised	(185,910	)	61.79		(7,137	)	30.62
Share grants outstanding as of June 30, 2020	483,511		$	88.90	91,619		$	39.97

Shares of Common Stock Issued Under Employee Stock Purchase Plan

The table below details the shares of common stock issued during 2020: 

	Number of shares	Per share price
Shares available as of December 31, 2019	132,449
Shares issued during the three months ended March 31, 2020	4,663	$	130.87
Shares issued during the three months ended June 30, 2020	3,730	$	133.19
Shares available as of June 30, 2020	124,056