Certain Financial Statement Information (Details 15) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Reconciliation of Shares Used to Calculate Basic and Diluted Net (Loss) Income Per Share
Net loss (USD)	$ (32,383)	$ (21,557)	$ (21,526)	$ (44,947)
Shares used in net loss per share computation:
Weighted average common shares outstanding, basic	72,610	64,947	70,985	63,678
Net effect of dilutive common share equivalents	0	0	0	0
Weighted average common shares outstanding, diluted	72,610	64,947	70,985	63,678
Basic and diluted net loss per share (in dollars per share)	$ (0.45)	$ (0.33)	$ (0.30)	$ (0.71)