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Deferred Revenue and Remaining Performance Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Deferred Revenue and Income Summary A summary of the balances as of September 30, 2021 and December 31, 2020 follows (in thousands):
September 30,December 31,
20212020
Products and services not yet delivered$469 $376