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Revenues (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Changes in Contract Assets and Contract Liabilities The following table reflects the changes in our contract assets and contract liabilities balances for the three months ended March 31, 2019:
 
March 31, 2019
 
December 31, 2018
 
Decrease
 
 
 
$
 
%
Accrued revenue
$
1,020

 
$
862

 
 
 
 
Costs and estimated profits in excess of billings
8,074

 
9,159

 
 
 
 
Contract assets
$
9,094

 
$
10,021

 
$
(927
)
 
(9
)%
 
 
 
 
 
 
 
 
Deferred revenue
$
7,010

 
$
8,335

 
 
 
 
Billings in excess of costs and profits recognized
1,426

 
3,210

 
 
 
 
Contract liabilities
$
8,436

 
$
11,545

 
$
(3,109
)
 
(27
)%