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Certain Financial Statement Information (Details Textual) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Sep. 30, 2014 Options and Restricted Stock Units [Member]	Sep. 30, 2013 Options and Restricted Stock Units [Member]	Sep. 30, 2014 Options and Restricted Stock Units [Member]	Sep. 30, 2013 Options and Restricted Stock Units [Member]
Certain Financial Statement Information [Line Items]
Impairment of a strategic investment	$ 2,500	$ 0
Gross unrealized gain	$ 3,551		$ 3,455
Antidilutive securities excluded from net loss per share computation				1.0	1.7	1.2	1.3

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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