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Deferred Revenue and Remaining Performance Obligations (Tables)
3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Deferred Revenue and Income Summary A summary of the balances as of March 31, 2022 and December 31, 2021 follows (in thousands):
March 31,December 31,
20222021
Products and services not yet delivered$398 $451