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Stockholder's Equity (Tables)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Share Grants Activity
The following table represents the share grants activity for the three months ended March 31, 2021: 
Restricted stockOptions
Number of
shares		Weighted
average grant
date fair value		Number of sharesWeighted
average grant
date fair value
Share grants outstanding as of December 31, 2020469,631 $89.69 74,235 $42.07 
Granted118,495 185.00 — — 
Vested or exercised(146,645)185.61 — — 
Share grants outstanding as of March 31, 2021441,481 $119.64 74,235 $42.07 
Shares of Common Stock Issued Under Employee Stock Purchase Plan
The table below details the shares of common stock issued during 2021: 
Number of
shares		Per share
price
Shares available as of December 31, 2020118,136 
Shares issued during the three months ended March 31, 20213,204 $202.66 
Shares available as of March 31, 2021114,932