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

Refer to Note 20 to the Consolidated Financial Statements for further information regarding acquisitions.

For its 2017 analysis of goodwill, management elected to perform a qualitative assessment (commonly known as “step zero”). Based upon this assessment, management does not believe that it is more likely than not that the carrying value of the reporting unit exceeds its fair value. Factors that management considered in the qualitative assessment include macroeconomic conditions, industry and market considerations, overall financial performance (both current and projected), changes in management or strategy, changes in the composition or carrying amount of net assets, and market capitalization. As of December 31, 2017, management does not believe any qualitative factors exist that would change the conclusion of its assessment.