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Contracts Receivable and Retainage - Amounts Due on Contracts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | $ 28,466 | $ 20,169
Total contracts receivable | 30,214 | 21,173
Less allowance for doubtful accounts | 1,748 | 1,004
Net contracts receivable | 28,466 | 20,169
Completed Contracts |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | 10,246 | 6,812
Contracts In Progress |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | 15,513 | 14,248
Retainage | 4,455 | 113
Top 2 Customers |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | $ 15,600 |
Percentage of contract receivable | 55.10% |
Top 3 Customers |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables |  | $ 8,600
Percentage of contract receivable |  | 42.70%

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