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Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue From Contract With Customer [Abstract]  
Summary of Changes in Contract Liabilities

The following table presents the changes in the Company’s contract liabilities during the year ended December 31, 2019:

 

(in thousands)

 

Balance at

Beginning of

Period

 

 

Additions

 

 

Deductions

 

 

Balance at

End of

Period

 

Contract liabilities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Deferred revenue

 

$

2,663

 

 

$

—

 

 

$

(2,663

)

 

$

—