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Revenue - Deferred revenue and other income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Change in Contract with Customer, Asset and Liability [Roll Forward]    
Beginning deferred revenue and other income $ 8,939  
Additions 5,438  
Amount of deferred revenue and other income recognized in the statement of operations (6,438)  
Ending deferred revenue and other income 7,939  
Current deferred revenue and other income 7,939 $ 8,370
Long-term deferred revenue and other income $ 0 $ 569