Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		9 Months Ended
	Jan. 31, 2012	Jan. 31, 2009 Amendments	Dec. 31, 2012 Company	Apr. 30, 2011	Mar. 31, 2011
Contingencies (Textual) [Abstract]
Companies named as Potentially Responsible Parties			100
Amendments approved to consent decree		2
Percent of contribution to the total waste	0.50%
Reimbursement seeking for contract damages from Xtera					$ 1.0
Reimbursement seeking by Xtera for development and royalties previously paid by TPack				$ 1.7