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Acquisition - Summary of acquisition by acquisition (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Goodwill |  | $ 56,596 | $ 56,588
Huen Electric Inc [Member] |  |  |
Consideration paid | $ 47,082 | 47,082 |
Preliminary estimated net asset adjustments | 10,749 | 10,834 |
Total consideration, net of net asset adjustments | 57,831 | 57,916 |
Accounts receivable, net | 33,903 | 33,696 |
Contract assets | 10,570 | 11,580 |
Other current and long term assets | 88 | 77 |
Property and equipment | 3,188 | 3,188 |
Intangible assets | 0 | 24,300 |
Accounts payable | (9,592) | (10,866) |
Contract liabilities | (6,394) | (5,869) |
Other current liabilities | (6,570) | (6,521) |
Net identifiable assets and liabilities | 25,193 | 49,585 |
Unallocated intangible assets | 9,800 | 0 |
Total acquired assets and liabilities | 34,993 | 49,585 |
Fair value of acquired noncontrolling interest | (1,273) | (1,280) |
Goodwill | $ 24,111 | 9,611 |
Consideration paid |  | 0 |
Preliminary estimated net asset adjustments |  | 85 |
Total consideration, net of net asset adjustments |  | 85 |
Accounts receivable, net |  | (207) |
Contract assets |  | 1,010 |
Other current and long term assets |  | (11) |
Property and equipment |  | 0 |
Intangible assets |  | 24,300 |
Accounts payable |  | (1,274) |
Contract liabilities |  | 525 |
Other current liabilities |  | 49 |
Net identifiable assets and liabilities |  | 24,392 |
Unallocated intangible assets |  | (9,800) |
Total acquired assets and liabilities |  | 14,592 |
Fair value of acquired noncontrolling interest |  | (7) |
Goodwill |  | $ (14,500) |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of other assets expected to be realized or consumed before 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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- 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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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: 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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