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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, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 51,441 | $ 50,851
Accumulated depreciation | 29,333 | 27,177
Total | 22,108 | 23,674
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 | $ 3,072 | 3,045
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 | $ 13,237 | 13,273
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 | $ 25,138 | 24,953
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 | $ 1,574 | 1,574
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 | 3,077
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 | 842
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 | $ 451 | $ 73

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + 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 (c) -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 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 4: 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=6877327&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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