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Deferred Revenue
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Deferred Revenue Deferred Revenue
The Company records deferred revenue when revenue is to be recognized subsequent to invoicing. For extended service contracts, the Company generally invoices customers at the beginning of the extended service contract term. The Company’s extended service contracts typically have one to three-year terms. Deferred revenue also includes payments for training and extended marketing support services. Approximately 88% of the Company’s deferred revenue balance of $11.1 million as of March 31, 2022 will be recognized over the next 12 months.
The following table provides changes in the deferred revenue balance for the three months ended March 31, 2022 and 2021 (in thousands):
Three Months Ended
March 31,
20222021
Beginning balance$10,825 $11,237 
Add: Payments received4,864 4,929 
Less: Revenue(458)(445)
Less: Revenue recognized from beginning balance(4,167)(3,984)
Ending balance$11,064 $11,737 
Costs for extended service contracts were $1.7 million and $2.0 million for the three months ended March 31, 2022, and March 31, 2021, respectively.