CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (11,717)		$ (32,383)		$ (24,782)		$ (21,526)
Other comprehensive loss, net of tax:
Unrealized (loss) gain on investments	(171)	[1]	(696)	[1]	296	[1]	(5,225)	[1]
Loss on foreign currency translation	(127)		(151)		(215)		(340)
Other comprehensive loss, net of tax	(298)		(847)		81		(5,565)
Total comprehensive loss	(12,015)		(33,230)		(24,701)		(27,091)
Reclassification adjustment from AOCI to earnings, short term investments	$ (5)		$ (86)		$ 0		$ (3,284)

[1] The amounts reclassified from accumulated other comprehensive (loss) income and recorded in interest income (expense), net in the Condensed Consolidated Statement of Operations relating to short-term investments were zero for the three and six months ended September 30, 2014 and zero and $3.3 million for the three and six months ended September 30, 2013, respectively. Refer to Note 2, Certain Financial Statement Information, to the Condensed Consolidated Financial Statements for additional details.