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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying amount of goodwill
The following is a summary of the changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 (in thousands):
 
E&P Technology & Services
 
Optimization Software & Services
 
Total
Balance at January 1, 2016
$
2,943

 
$
23,331

 
$
26,274

Impact of foreign currency translation adjustments
—

 
(4,066
)
 
(4,066
)
Balance at December 31, 2016
2,943

 
19,265

 
22,208

Impact of foreign currency translation adjustments
—

 
1,881

 
1,881

Balance at December 31, 2017
$
2,943

 
$
21,146

 
$
24,089