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Stockholders' Equity and Equity Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2021
Stockholders Equity Note [Abstract]  
Summary of Unvested Restricted Common Stock Activity A summary of our unvested restricted common stock activity during the quarter and nine months ended September 30, 2021 is as follows (shares in thousands):

 

 

Quarter Ended

 

 

Nine Months Ended

 

 

 

September 30, 2021

 

 

September 30, 2021

 

 

 

Shares

 

 

Weighted-
Average
Grant
Date Fair Value

 

 

Shares

 

 

Weighted-
Average
Grant
Date Fair Value

 

 

Unvested awards, beginning

 

1,167

 

 

$

43.95

 

 

 

1,041

 

 

$

41.31

 

 

Awards granted

 

58

 

 

 

46.78

 

 

 

577

 

 

 

47.75

 

 

Awards forfeited/cancelled

 

(40

)

 

 

44.76

 

 

 

(79

)

 

 

43.37

 

 

Awards vested

 

(44

)

 

 

39.02

 

 

 

(398

)

 

 

41.40

 

 

Unvested awards, ending

 

1,141

 

 

$

44.26

 

 

 

1,141

 

 

$

44.26