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Employee Retirement and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2017
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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, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Cost of service revenue |  | $ | 542 |  |  | $ | 446 |  |  | $ | 1,332 |  |  | $ | 1,142 |
Cost of equipment revenue |  |  | 49 |  |  |  | 34 |  |  |  | 136 |  |  |  | 78 |
Engineering, design and development |  |  | 897 |  |  |  | 970 |  |  |  | 2,801 |  |  |  | 2,432 |
Sales and marketing |  |  | 1,305 |  |  |  | 1,498 |  |  |  | 3,473 |  |  |  | 3,799 |
General and administrative |  |  | 2,490 |  |  |  | 2,052 |  |  |  | 7,265 |  |  |  | 5,535 |
Total stock-based compensation expense |  | $ | 5,283 |  |  | $ | 5,000 |  |  | $ | 15,007 |  |  | $ | 12,986 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + Details
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