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Stockholders' Equity Stock-Based Compensation Expense By Statement Of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax | $ 16,334 | $ 9,347 | $ 7,595
Tax benefit | 0 | 0 | 0
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax | 16,334 | 9,347 | 7,595
Cost of service revenue |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax | 1,159 | 692 | 372
Cost of product revenue |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax | 0 | 0 | 0
Research and development |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax | 2,914 | 1,495 | 967
Sales and marketing |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax | 6,133 | 3,748 | 2,217
General and administrative |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax | $ 6,128 | $ 3,412 | $ 4,039

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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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