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Goodwill (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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