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Stockholders' Equity and Equity Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Stockholders Equity Note [Abstract]  
Summary of Unvested Restricted Common Stock Activity A summary of our unvested restricted common stock activity during the first quarter of 2021 is as follows (shares in thousands):

 

Quarter Ended

 

 

 

March 31, 2021

 

 

 

Shares

 

 

Weighted-

Average

Grant

Date Fair Value

 

 

Unvested awards, beginning

 

1,041

 

 

$

41.31

 

 

Awards granted

 

513

 

 

 

47.88

 

 

Awards forfeited/cancelled

 

(2

)

 

 

40.81

 

 

Awards vested

 

(340

)

 

 

41.65

 

 

Unvested awards, ending

 

1,212

 

 

$

43.87