Stockholder's Equity (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Share Grants Activity

The following table represents the share grants activity for the nine months ended September 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	(199,330)	62.31		(16,286)	32.93
Share grants outstanding as of September 30, 2020	470,091	$	89.32	82,470	$	42.25

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 issued during the three months ended September 30, 2020	3,454	$165.60
Shares available as of September 30, 2020	120,602