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Property, plant and equipment - Summary of Elements of property, plant and equipment (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 52,702 | $ 52,284
Accumulated depreciation | 32,068 | 30,374
Total | 20,634 | 21,910
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 1,255 | 1,255
Land improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 319 | 319
Land improvements | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 6 years |
Land improvements | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 10 years |
Buildings |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 1,446 | 1,446
Buildings | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 25 years |
Buildings | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 39 years |
Building improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 3,099 | 3,072
Building improvements | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 25 years |
Building improvements | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 39 years |
Cylinders |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 13,352 | 13,624
Cylinders | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 15 years |
Cylinders | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 30 years |
Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 25,221 | 25,138
Equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 3 years |
Equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 10 years |
Equipment under capital lease |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 315 | 315
Equipment under capital lease | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 5 years |
Equipment under capital lease | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 7 years |
Vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 1,740 | 1,537
Vehicles | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 3 years |
Vehicles | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 5 years |
Lab and computer equipment, software |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 3,103 | 3,103
Lab and computer equipment, software | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 2 years |
Lab and computer equipment, software | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 8 years |
Furniture & fixtures |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 679 | 679
Furniture & fixtures | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 5 years |
Furniture & fixtures | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 10 years |
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 852 | 852
Leasehold improvements | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 3 years |
Leasehold improvements | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Estimated Lives | 5 years |
Equipment under construction |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 1,321 | $ 944

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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