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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Share-based compensation expense: |  |  |
Total share-based compensation expense | $ 6,698 | $ 8,916 | $ 11,583
Cost of revenue |  |  |
Share-based compensation expense: |  |  |
Total share-based compensation expense | 895 | 1,241 | 1,489
Research and development |  |  |
Share-based compensation expense: |  |  |
Total share-based compensation expense | 1,300 | 1,864 | 2,559
Sales and marketing |  |  |
Share-based compensation expense: |  |  |
Total share-based compensation expense | 2,255 | 2,907 | 3,506
General and administrative |  |  |
Share-based compensation expense: |  |  |
Total share-based compensation expense | $ 2,248 | $ 2,904 | $ 4,029

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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 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=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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