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Assets Held for Sale - (Tables) | 9 Months Ended
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Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract] |
Schedule of assets classified as held for sale | The following summarized financial information has been segregated from continuing operations and reported as Discontinued Operations for the three and nine months ended September 30, 2017 (in thousands):
| Three months ended September 30, 2017 |  | Nine months ended September 30, 2017
Drilling Technologies |  |  |
Revenue | $ | — |  |  | $ | 11,534 |
Cost of revenue | — |  |  | (7,259 | )
Selling, general and administrative | (791 | ) |  | (6,562 | )
Research and development | — |  |  | (6 | )
Gain on disposal of long-lived assets | 36 |  |  | 97 |
Loss from operations | (755 | ) |  | (2,196 | )
Other income (expense) | 26 |  |  | (91 | )
Gain (loss) on sales of businesses | 463 |  |  | (902 | )
Loss on write-down of assets held for sale | — |  |  | (6,831 | )
Loss before income taxes | (266 | ) |  | (10,020 | )
Income tax benefit | 581 |  |  | 3,473 |
Net income (loss) from discontinued operations | $ | 315 |  |  | $ | (6,547 | )
Production Technologies |  |  |
Revenue | $ | — |  |  | $ | 4,002 |
Cost of revenue | — |  |  | (3,189 | )
Selling, general and administrative | (64 | ) |  | (1,739 | )
Research and development | — |  |  | (364 | )
Loss from operations | (64 | ) |  | (1,290 | )
Other expense | — |  |  | (52 | )
Gain on sale of businesses | 61 |  |  | 233 |
Loss on write-down of assets held for sale | — |  |  | (9,718 | )
Loss before income taxes | (3 | ) |  | (10,827 | )
Income tax benefit | 7 |  |  | 3,753 |
Net income (loss) from discontinued operations | $ | 4 |  |  | $ | (7,074 | )
Drilling Technologies and Production Technologies |  |  |
Income (loss) from discontinued operations, net of tax | $ | 319 |  |  | $ | (13,621 | )
The assets classified as held for sale at December 31, 2017 is as follows (in thousands):
Property and equipment, net | $ | 4,998 |
Valuation allowance | — |
Assets held for sale, net | $ | 4,998 |

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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1474-107760 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721677-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721659-107760 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721671-107760 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760 + Details
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