Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

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, 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
Balance as of December 31, 2018	$	113,208