Segment and Geographic Information - Summary of Accounts Receivable Derived from Customers (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Customer 1
Entity Wide Revenue Major Customer [Line Items]
Accounts receivable	$ 5,340	$ 4,146
Customer 2
Entity Wide Revenue Major Customer [Line Items]
Accounts receivable	5,237
Customer 3
Entity Wide Revenue Major Customer [Line Items]
Accounts receivable	3,522
Customer 4
Entity Wide Revenue Major Customer [Line Items]
Accounts receivable		$ 2,940