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Organization and Significant Accounting Policies - Property and Equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Total cost | $ 35,462 | $ 35,415
Less accumulated depreciation | (24,542) | (23,414)
Total net book value | 10,920 | 12,001
Land |  |
Total cost | $ 1,440 | 1,440
Building |  |
Depreciable Life | 39 years |
Total cost | $ 4,535 | 4,535
Building and leasehold improvements |  |
Total cost | $ 5,087 | 5,102
Building and leasehold improvements | Minimum |  |
Depreciable Life | 3 years |
Building and leasehold improvements | Maximum |  |
Depreciable Life | 39 years |
Field equipment |  |
Total cost | $ 19,870 | 19,797
Field equipment | Minimum |  |
Depreciable Life | 3 years |
Field equipment | Maximum |  |
Depreciable Life | 4 years |
Computer equipment and software |  |
Total cost | $ 2,973 | 2,978
Computer equipment and software | Minimum |  |
Depreciable Life | 2 years |
Computer equipment and software | Maximum |  |
Depreciable Life | 3 years |
Furniture and fixtures |  |
Total cost | $ 1,521 | 1,527
Furniture and fixtures | Minimum |  |
Depreciable Life | 3 years |
Furniture and fixtures | Maximum |  |
Depreciable Life | 10 years |
Vehicles |  |
Depreciable Life | 5 years |
Total cost | $ 36 | $ 36

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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 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 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 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=6879938&loc=d3e572229-122910 Reference 4: 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 + Details
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