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Property, Plant and Equipment and Leased Facilities and Equipment - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) ft² a Renewal_options | Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |
Depreciation expense for continuing operations | $ 4.1 | $ 5.0
Operating lease, right-of-use asset | $ 0.9 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other noncurrent assets |
Current lease liability | $ 0.6 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Total current liabilities |
Long-term lease liability | $ 1.4 |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other noncurrent liabilities |
Lease agreement expenses | $ 1.0 | 0.9
Operating lease payments | $ 1.5 | $ 1.4
Operating lease, term of contract | 3 years 1 month 6 days |
Operating lease, weighted-average discount rate (percentage) | 6.70% |
Houston, Texas |  |
Property, Plant and Equipment [Line Items] |  |
Office space area of leased premises (in sqft or acres) | ft² | 17,000 |
Jennings, Louisiana |  |
Property, Plant and Equipment [Line Items] |  |
Office space area of leased premises (in sqft or acres) | a | 180 |
Lease description | During the fourth quarter 2020, we closed our Jennings Facility and do not intend to exercise our renewal options |
Jennings, Louisiana | Prospect Shipyard |  |
Property, Plant and Equipment [Line Items] |  |
Lease renewal options | Renewal_options | 2 |
Lease renewal term | 10 years |
Lake Charles, Louisiana |  |
Property, Plant and Equipment [Line Items] |  |
Office space area of leased premises (in sqft or acres) | a | 10 |
Lease description | During the fourth quarter 2020, we closed our Lake Charles Facility and do not intend to exercise our renewal options |
Lake Charles, Louisiana | Prospect Shipyard |  |
Property, Plant and Equipment [Line Items] |  |
Lease renewal options | Renewal_options | 3 |
Lease renewal term | 5 years |

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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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