Quarterly report pursuant to Section 13 or 15(d)

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

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Description of Stock Plans - Intrinsic Value of Options Exercised and Fair Value of Options Vested (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Total fair value of options vested $ 1,265 $ 1,266
Total intrinsic value of options exercised $ 3 $ 5