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Summary of Significant Accounting Policies and Other Items - Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Depreciation expense |  |  |
Total depreciation and amortization | $ 38,854 | $ 30,153 | $ 23,271
Cost of Sales | Product revenue |  |  |
Depreciation expense |  |  |
Depreciation - Cost of sales | 3,304 | 3,262 | 3,169
Cost of Sales | Rental revenue |  |  |
Depreciation expense |  |  |
Depreciation - Cost of sales | 24,881 | 17,997 | 14,912
Cost of Sales | Field service and other revenue |  |  |
Depreciation expense |  |  |
Depreciation - Cost of sales | 9,986 | 8,456 | 4,786
Selling, General and Administrative Expenses |  |  |
Depreciation expense |  |  |
Depreciation - SG&A | $ 683 | $ 438 | $ 404

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- Definition Amount of expense for allocation of cost of tangible asset over its useful life directly used in production of good and rendering of service. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(2)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: 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=118932676&loc=d3e3602-108585 + Details
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