Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans - Intrinsic Value of Options Exercised and Fair Value of Options Vested (Details)

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Description of Stock Plans - Intrinsic Value of Options Exercised and Fair Value of Options Vested (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Total fair value of options vested $ 2,750 $ 2,250
Total intrinsic value of options exercised $ 101 $ 8