Segment, Geographic Location, and Customer Information - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments	1
Customer 1 [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales made to three major customers	33.00%	30.00%
Percentage of accounts receivable derived from three major customers	19.00%	23.00%
Customer 2 [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales made to three major customers	18.00%	18.00%
Percentage of accounts receivable derived from three major customers	10.00%	12.00%
Customer 3 [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales made to three major customers	14.00%	15.00%
Percentage of accounts receivable derived from three major customers	10.00%	12.00%