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Segment Disclosures - Summarized Segment Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 54,014 | $ 45,868 | $ 111,304 | $ 83,860 |
Gross profit (loss) | (699) | (11,620) | (20) | (16,518) |
Operating income (loss) | (6,401) | (16,260) | (11,181) | (25,477) |
Total assets | 256,689 | 307,586 | 256,689 | 307,586 | $ 270,840
Depreciation and amortization expense | 2,611 | 2,776 | 5,360 | 7,476 |
Capital expenditures | 820 | 1,433 | 891 | 1,824 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Gross profit (loss) | (384) | (90) | (769) | (351) |
Operating income (loss) | (2,681) | (2,267) | (5,204) | (4,007) |
Total assets | 30,801 | 14,390 | 30,801 | 14,390 |
Depreciation and amortization expense | 130 | 207 | 268 | 331 |
Capital expenditures | 69 | 35 | 69 | 52 |
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (1,283) | (1,821) | (1,771) | (3,170) |
Gross profit (loss) | 0 | 0 | 0 | 0 |
Operating income (loss) | 0 | 0 | 0 | 0 |
Total assets | 0 | 0 | 0 | 0 |
Depreciation and amortization expense | 0 | 0 | 0 | 0 |
Capital expenditures | 0 | 0 | 0 | 0 |
Fabrication | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 8,590 | 13,990 | 25,860 | 24,199 |
Gross profit (loss) | (1,667) | 1,931 | (1,886) | (1,034) |
Operating income (loss) | (3,227) | 1,098 | (4,821) | (2,688) |
Total assets | 101,498 | 164,211 | 101,498 | 164,211 |
Depreciation and amortization expense | 1,047 | 1,152 | 2,196 | 4,287 |
Capital expenditures | 0 | 746 | 0 | 848 |
Shipyards | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 23,620 | 18,303 | 42,185 | 36,724 |
Gross profit (loss) | (2,776) | (13,851) | (3,799) | (15,556) |
Operating income (loss) | (3,374) | (14,834) | (5,192) | (17,892) |
Total assets | 88,305 | 98,393 | 88,305 | 98,393 |
Depreciation and amortization expense | 1,051 | 995 | 2,120 | 2,004 |
Capital expenditures | 653 | 546 | 659 | 818 |
Services | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 22,205 | 15,396 | 44,075 | 26,107 |
Gross profit (loss) | 3,585 | 390 | 6,199 | 423 |
Operating income (loss) | 2,823 | (257) | 4,703 | (890) |
Total assets | 35,197 | 30,592 | 35,197 | 30,592 |
Depreciation and amortization expense | 383 | 422 | 776 | 854 |
Capital expenditures | 98 | 106 | 163 | 106 |
EPC | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 882 | 0 | 955 | 0 |
Gross profit (loss) | 543 | 0 | 235 | 0 |
Operating income (loss) | 58 | 0 | (667) | 0 |
Total assets | 888 | 0 | 888 | 0 |
Depreciation and amortization expense | 0 | 0 | 0 | 0 |
Capital expenditures | $ 0 | $ 0 | $ 0 | $ 0 |

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