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Deferred Revenue, Income and Remaining Performance Obligations (Tables)
 9 Months Ended
Sep. 30, 2018
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue and Income Summary
A summary of the balances as of September 30, 2018 and December 31, 2017 follows (in thousands):
 
September 30,
December 31,
 
2018
2017
Products and services not yet delivered
$
202

$
71

Arizona Commerce Authority grant
—

1,000

Deferred revenue and income
$
202

$
1,071