Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock-Based Compensation        
Stock-based compensation expense $ 385 $ 537 $ 848 $ 1,223
Cost of goods sold        
Stock-Based Compensation        
Stock-based compensation expense 35 31 69 52
Research and development        
Stock-Based Compensation        
Stock-based compensation expense 24 83 10 160
Selling, general and administrative        
Stock-Based Compensation        
Stock-based compensation expense $ 326 $ 423 $ 769 $ 1,011