Concentrations of Risks (Details)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended					12 Months Ended	0 Months Ended
	Dec. 31, 2013 Net revenue Sales risk customer	Dec. 31, 2012 Net revenue Sales risk customer	Dec. 31, 2013 Net revenue Sales risk customer	Dec. 31, 2012 Net revenue Sales risk customer	Dec. 31, 2013 Net revenue Sales risk Minimum	Dec. 31, 2012 Net revenue Sales risk Minimum	Dec. 31, 2013 Net revenue Sales risk Minimum	Dec. 31, 2012 Net revenue Sales risk Minimum	Dec. 31, 2013 Net revenue Electronics distributor risk	Dec. 31, 2012 Net revenue Electronics distributor risk	Dec. 31, 2013 Accounts receivable Sales risk customer	Mar. 31, 2013 Accounts receivable Sales risk customer	Dec. 31, 2013 Accounts receivable Sales risk Maximum	Mar. 31, 2013 Accounts receivable Sales risk Maximum
Concentration of Risk
Number of customers exceeding threshold	1	1	1	1							0	0
Concentration risk, percentage					10.00%	10.00%	10.00%	10.00%	44.00%	44.00%			10.00%	10.00%