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Business Combination - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 06, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Business Combination |  |  |  |
Goodwill |  | $ 48,522 |  | $ 48,651
Cash paid |  | $ 0 | $ 8,854 |
Residential Control Systems, Inc |  |  |  |
Business Combination |  |  |  |
Accounts receivable | $ 429 |  |  |
Inventories | 1,508 |  |  |
Prepaid expenses and other current assets | 7 |  |  |
Property, plant and equipment | 14 |  |  |
Current liabilities | (408) |  |  |
Net tangible assets acquired | 1,550 |  |  |
Goodwill | 5,494 |  |  |
Total purchase price | 12,594 |  |  |
Less: Contingent consideration | (3,700) |  |  |
Cash paid | 8,894 |  |  |
Residential Control Systems, Inc | Minimum |  |  |  |
Business Combination |  |  |  |
Estimated lives of property, plant and equipment |  | 1 year |  |
Residential Control Systems, Inc | Maximum |  |  |  |
Business Combination |  |  |  |
Estimated lives of property, plant and equipment |  | 4 years |  |
Residential Control Systems, Inc | Trade name |  |  |  |
Business Combination |  |  |  |
Finite-lived intangible assets | 400 |  |  |
Estimated useful life of intangible assets |  | 8 years |  |
Residential Control Systems, Inc | Customer relationships |  |  |  |
Business Combination |  |  |  |
Finite-lived intangible assets | 5,000 |  |  |
Estimated useful life of intangible assets |  | 10 years |  |
Residential Control Systems, Inc | Order backlog |  |  |  |
Business Combination |  |  |  |
Finite-lived intangible assets | $ 150 |  |  |
Estimated useful life of intangible assets |  | 1 year |  |

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