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Property, plant and equipment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 14,662 | $ 14,230
Accumulated depreciation | 10,126 | 9,465
Total | 4,536 | 4,765
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 535 | 535
Buildings |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 830 | 830
Property, plant and equipment, useful life | 39 years |
Building improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 776 | 770
Property, plant and equipment, useful life | 39 years |
Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 8,560 | 8,253
Equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 7 years |
Equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 3 years |
Equipment under capital lease |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 137 | 231
Equipment under capital lease | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 7 years |
Equipment under capital lease | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 5 years |
Vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 1,258 | 1,212
Property, plant and equipment, useful life | 5 years |
Lab and computer equipment, software |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 2,210 | 2,017
Lab and computer equipment, software | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 5 years |
Lab and computer equipment, software | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 3 years |
Furniture & fixtures |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 249 | 246
Furniture & fixtures | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 8 years |
Furniture & fixtures | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, useful life | 7 years |
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 70 | 40
Property, plant and equipment, useful life | 3 years |
Equipment under construction |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 37 | $ 96

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + 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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