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Segment Reporting Revenue and Property and Equipment by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Geographic Areas, Revenue from External Customers 100% 100% 100% 100%  
Number of customers at more than 10% of revenue 0 0 0 0  
Geographic Areas, Long-Lived Assets $ 15,315   $ 15,315   $ 12,375
Americas          
Geographic Areas, Revenue from External Customers 89% 86% 88% 87%  
Geographic Areas, Long-Lived Assets $ 11,231   $ 11,231   9,165
Europe          
Geographic Areas, Revenue from External Customers 10% 14% 11% 11%  
Geographic Areas, Long-Lived Assets $ 3,902   $ 3,902   2,642
Asia-Pacific          
Geographic Areas, Revenue from External Customers 1% 0% 1% 2%  
Geographic Areas, Long-Lived Assets $ 182   $ 182   $ 568