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Business Combination (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | May 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses |  |  | $ 0 | $ 6,377 |
Working capital settlement paid |  | $ 400 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Goodwill |  |  | 3,229 |  | $ 3,229
WattMaster |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses | $ 6,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Accounts receivable |  |  | 1,082 |  |
Inventories |  |  | 1,380 |  |
Property, plant and equipment |  |  | 340 |  |
Intellectual property |  |  | 700 |  |
Goodwill |  |  | 3,229 |  |
Assumed current liabilities |  |  | (354) |  |
Consideration paid |  |  | $ 6,377 |  |

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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=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, 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=116869197&loc=d3e4845-128472 + Details
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