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Interim Financial Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Contract retentions | $ 1,596 |  | $ 1,596 |  | $ 1,065
Allowance for doubtful accounts | $ 246 |  | $ 246 |  | $ 208
Licensing contract term |  |  | 5 years |  |
Minimum |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Royalty percent earned on licensing agreement | 4.00% |  | 4.00% |  |
Maximum |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Royalty percent earned on licensing agreement | 6.00% |  | 6.00% |  |
Cost of Goods Sold |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Prior period reclassification adjustment | $ 78 | $ 60 | $ 243 | $ 86 |
General and Administrative Expense |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Prior period reclassification adjustment | $ (78) | $ (60) | $ (243) | $ (86) |

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