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Contracts Receivable and Retainage - Amounts Due on Contracts (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($)
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | $ 20,169 | $ 47,060
Total contracts receivable | 21,173 | 47,104
Less allowance for doubtful accounts | 1,004 | 44
Net contracts receivable | 20,169 | 47,060
Completed Contracts |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | 6,812 | 15,904
Long-term receivables due after one year | 0 | 0
Contracts In Progress |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | 14,248 | 31,148
Retainage due within one year | 113 | $ 52
Top 6 Customers |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | $ 8,600 |
Percentage of contract receivable | 42.70% |
Number of major customers, contracts receivable | Customer | 3 |

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