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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2020
Revenue Recognition And Deferred Revenue [Abstract]  
Schedule of Changes in Unearned Revenue Balance

Changes in the unearned revenue balance during the three months ended March 31, 2020 were as follows:

Balance as of December 31, 2019

 

$

579

 

Additions to unearned revenue

 

 

—

 

Reclassified to revenue

 

 

(389

)

Currency impacts

 

 

(4

)

Balance as of March 31, 2020

 

$

186