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Deferred Revenue
 12 Months Ended
Dec. 31, 2021
Contract with Customer, Liability [Abstract]  
Deferred Revenue Deferred RevenueDeferred revenue as of December 31, 2021 and 2020 consisted of the following (in thousands):
As of December 31,
20212020
Deferred Revenue
Maintenance agreements$4,183 $1,775 
Service agreements622 147 
Total Deferred Revenue$4,805 $1,922 
The fair value of the deferred revenue approximates the services to be rendered.