Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Unrecognized accounts receivable and deferred revenue	$ 1,000	$ 120
Amortization included as cost of product	51	204
Foreign currency gains (losses)	3	(625)	25
Advertising expense	$ 1,100	$ 273	$ 175
Computer Equipment And Internal Use Software
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, Estimated Useful Life	3 years
Maximum | Computer Equipment And Internal Use Software
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, Estimated Useful Life	5 years
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage, number of customers	1	0
Concentration risk percentage	10.00%	10.00%
Customer Concentration Risk | Sales Revenue
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage, number of customers	0	0	0
Customer Concentration Risk | Sales Revenue | Maximum
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%