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Selected Quarterly Financial Date (Unaudited) - Allocation of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Total stock-based compensation | $ 2,716 | $ 2,519 | $ 2,414 | $ 1,994 | $ 1,720 | $ 1,945 | $ 1,830 | $ 2,235 | $ 9,643 | $ 7,730 | $ 6,753
Cost of Revenue |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation | 424 | 357 | 329 | 265 | 227 | 233 | 218 | 188 |  |  |
Research and Development |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation | 549 | 547 | 528 | 435 | 401 | 475 | 340 | 574 |  |  |
Sales and Marketing |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation | 759 | 626 | 544 | 434 | 370 | 448 | 458 | 524 |  |  |
General and Administrative |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation | $ 984 | $ 989 | $ 1,013 | $ 860 | $ 722 | $ 789 | $ 814 | $ 949 |  |  |

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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 (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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