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Deferred Revenue, Income and Remaining Performance Obligations (Tables)
 6 Months Ended
Jun. 30, 2019
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue and Income Summary A summary of the balances as of June 30, 2019 and December 31, 2018 follows (in thousands):
 
June 30,
December 31,
 
2019
2018
Products and services not yet delivered
$
255

$
217