Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Detail)

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Summary of Significant Accounting Policies (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2015
Accounts Receivable | Customer A          
Significant Accounting Policies [Line Items]          
Concentrations of credit risk, percentage     18.10%   21.10%
Accounts Receivable | Customer B          
Significant Accounting Policies [Line Items]          
Concentrations of credit risk, percentage     12.40%   4.40%
Accounts Receivable | Customer C          
Significant Accounting Policies [Line Items]          
Concentrations of credit risk, percentage     10.50%   0.00%
Sales | Customer A          
Significant Accounting Policies [Line Items]          
Concentrations of credit risk, percentage 29.20% 52.60% 29.40% 58.50%  
Sales | Customer B          
Significant Accounting Policies [Line Items]          
Concentrations of credit risk, percentage 10.00% 0.00% 9.60% 0.00%  
Sales | Customer C          
Significant Accounting Policies [Line Items]          
Concentrations of credit risk, percentage 11.40% 0.00% 6.90% 0.00%