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Selected Quarterly Financial Data (Unaudited) - Allocation of Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total depreciation and amortization | $ 2,068 | $ 1,881 | $ 2,270 | $ 2,095 | $ 2,086 | $ 2,140 | $ 2,060 | $ 2,103 | $ 8,314 | $ 8,390 | $ 7,388
Cost of revenue |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization | 1,611 | 1,397 | 1,716 | 1,576 | 1,608 | 1,668 | 1,616 | 1,680 |  |  |
Research and development |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization | 170 | 182 | 237 | 206 | 224 | 204 | 161 | 148 |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization | 30 | 30 | 30 | 30 | 58 | 56 | 54 | 53 |  |  |
General and administrative |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization | $ 257 | $ 272 | $ 287 | $ 283 | $ 196 | $ 212 | $ 229 | $ 222 |  |  |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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