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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Income Taxes (Textual) [Abstract]        
Estimated annual effective tax rate (0.30%) (0.20%)    
Valuation allowance $ 23,200      
Unrecognized tax benefits 228 $ 212 $ 212 $ 210
Federal        
Income Taxes (Textual) [Abstract]        
Operating loss carryforwards 50,600      
Exercise of NQSOs 3,600      
Tax credit carryforwards 1,500      
State        
Income Taxes (Textual) [Abstract]        
Operating loss carryforwards 36,900      
Exercise of NQSOs 4,300      
Tax credit carryforwards $ 500