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Deferred Revenue and Remaining Performance Obligations (Tables)
 6 Months Ended
Jun. 30, 2021
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue and Income Summary A summary of the balances as of June 30, 2021 and December 31, 2020 follows (in thousands):
June 30,December 31,
20212020
Products and services not yet delivered$282 $376