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Employee Retirement and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2020
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Summary of Stock-Based Compensation Expense by Operating Expense | The following is a summary of our stock-based compensation expense by operating expense line in the unaudited condensed consolidated statements of operations (in thousands):
|  | For the Three Months |  |  | For the Nine Months |
|  | Ended September 30, |  |  | Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of service revenue |  | $ | 179 |  |  | $ | 27 |  |  | $ | 239 |  |  | $ | 90 |
Cost of equipment revenue |  |  | 203 |  |  |  | 60 |  |  |  | 338 |  |  |  | 211 |
Engineering, design and development |  |  | 584 |  |  |  | 158 |  |  |  | 902 |  |  |  | 439 |
Sales and marketing |  |  | 413 |  |  |  | 386 |  |  |  | 938 |  |  |  | 1,189 |
General and administrative |  |  | 3,301 |  |  |  | 1,641 |  |  |  | 5,866 |  |  |  | 4,802 |
Total stock-based compensation expense |  | $ | 4,680 |  |  | $ | 2,272 |  |  | $ | 8,283 |  |  | $ | 6,731 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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