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
6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Total fair value of options vested $ 855 $ 1,461
Total intrinsic value of options exercised $ 162 $ 9