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LEEVAC Transaction - Pro Forma Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 37,277 | $ 49,884 | $ 45,868 | $ 37,993 | $ 55,461 | $ 65,384 | $ 81,502 | $ 83,979 | $ 171,022 | $ 286,326 | $ 306,120
Net income (loss) | $ (24,279) | $ (3,110) | $ (10,923) | $ (6,454) | $ (3,555) | $ 541 | $ 5,540 | $ 989 | $ (44,766) | $ 3,515 | (25,364)
Pro forma revenue |  |  |  |  |  |  |  |  |  |  | 393,359
Pro forma net income (loss) |  |  |  |  |  |  |  |  |  |  | (26,281)
Pro Forma Adjustment to Historical Results |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 0
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 3,738
Effect of purchase price depreciation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 1,217
Elimination of interest expense |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 2,038
Income taxes |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 483
LEEVAC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 87,239
Net income (loss) |  |  |  |  |  |  |  |  |  |  | $ (4,655)

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