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Acquisitions - AQSense, S.L. Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 30, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 113,208 | $ 113,208 | $ 95,280 |
AQSense, S.L. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  |  | $ 168
Goodwill |  |  |  | 1,383
Accrued expenses |  |  |  | (14)
Purchase price |  |  |  | 2,519
Customer Relationships [Member] | AQSense, S.L. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | 598
Completed Technologies [Member] | AQSense, S.L. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | $ 384

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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