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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Oct. 01, 2017 | Apr. 12, 2017 | Apr. 04, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 113,208 |  |  | $ 95,280
ViDi Systems S.A. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash |  |  | $ 146 |
Accounts receivable |  |  | 425 |
Prepaid expenses and other current assets |  |  | 129 |
Property, plant, and equipment |  |  | 40 |
Deferred income tax asset |  |  | 620 |
Accounts payable |  |  | (98) |
Accrued expenses |  |  | (716) |
Deferred income tax liability |  |  | (1,008) |
Goodwill |  |  | 18,333 |
Purchase price |  |  | 23,015 |
ViDi Systems S.A. | Non-compete agreement |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  | 370 |
ViDi Systems S.A. | Completed technologies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  | $ 4,774 |
GVi Ventures, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  | $ 423 |  |
Inventories |  | 120 |  |
Prepaid expenses and other current assets |  | 1 |  |
Accounts payable |  | (152) |  |
Accrued expenses |  | (10) |  |
Goodwill |  | 1,476 |  |
Purchase price |  | 5,368 |  |
GVi Ventures, Inc. | Completed technologies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | 910 |  |
GVi Ventures, Inc. | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | $ 2,600 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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