Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Calculating Fair Value Options Granted Using the Black-Scholes Option- Pricing Model (Detail)

v3.7.0.1
Description of Stock Plans - Calculating Fair Value Options Granted Using the Black-Scholes Option- Pricing Model (Detail)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Minimum      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Risk-free interest rate 1.34% 1.37% 1.37%
Expected life of the options 5 years 8 months 7 days 5 years 8 months 23 days 5 years 8 months 23 days
Stock price volatility 73.00% 78.00% 115.00%
Expected forfeitures 10.00% 10.00% 10.00%
Maximum      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Risk-free interest rate 2.38% 2.27% 1.79%
Expected life of the options 9 years 307 days 10 years 6 years
Stock price volatility 130.00% 145.00% 145.00%
Expected forfeitures 35.00% 35.00% 35.00%