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Revenues (Tables)
 3 Months Ended
Mar. 31, 2020
Revenue From Contract With Customer [Abstract]  
Summary of Changes in Deferred Revenue Changes in deferred revenue were as follows:

 

 

Three Months Ended March 31,

 

 

 

2020

 

 

 

(in thousands)

 

Beginning balance

 

$

13,194

 

Deferral of revenue

 

 

21,000

 

Recognition of unearned revenue

 

 

(9,495

)

Ending balance

 

$

24,699