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Revenue and Contract Costs - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Contracts in progress | $ 31,643,000 | $ 31,643,000 |  | $ 26,829,000
Advance billings on contracts | 8,642,000 | 8,642,000 |  | 3,977,000
Accrued contract losses | 3,514,000 | 3,514,000 |  | $ 387,000
Change in estimated costs | 10,200,000 |  |  |
Loss related to disputed change orders |  |  | $ 488,000 |
Project, Approved Scope, Unapproved Price |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Revenue |  | 0 |  |
One Major Customer | Customer Concentration Risk | Costs in Excess of Billings |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Contracts in progress | 28,100,000 | 28,100,000 |  |
Two Major Customers | Customer Concentration Risk | Billings in Excess of Costs |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Customer advances | $ 7,800,000 | $ 7,800,000 |  |

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57788-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57807-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57795-111642 + Details
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- Definition Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15a) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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