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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2014
 
$
77,388

Acquisition of Manatee Works, Inc.
 
4,060

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