Segment Disclosure - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment Disclosure (Textual) [Abstract]
Number of reporting segments	1
Customer Concentration Risk [Member] | One Customer [Member]
Segment Disclosure (Textual) [Abstract]
Sales accounted	$ 91,726	$ 87,925	$ 99,459
Customer Concentration Risk [Member] | Second Customer [Member]
Segment Disclosure (Textual) [Abstract]
Sales accounted	$ 38,817	$ 38,348	$ 48,948
Customer Concentration Risk [Member] | Sales [Member] | One Customer [Member]
Segment Disclosure (Textual) [Abstract]
Sales accounted, percentage	28.00%	27.00%	27.00%
Customer Concentration Risk [Member] | Sales [Member] | Second Customer [Member]
Segment Disclosure (Textual) [Abstract]
Sales accounted, percentage	12.00%	12.00%	13.00%