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Goodwill (Tables)
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the Carrying Value of Goodwill
The changes in the carrying value of goodwill were as follows (in thousands):
 
 
Amount
Balance as of December 31, 2015
 
$
81,448

Acquisition of AQSense, S.L.
 
1,383

Acquisition of EnShape GmbH
 
8,613

Acquisition of Chiaro Technologies LLC
 
2,911

Acquisition of Webscan, Inc.
 
925

Balance as of December 31, 2016
 
95,280

Acquisition of ViDi Systems, S.A.
 
18,333

Acquisition of GVi Ventures, Inc.
 
1,476

Adjustment to EnShape goodwill
 
(1,881
)
Balance as of December 31, 2017
 
$
113,208