Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss		$ (8,061)	$ (11,717)	$ (15,465)	$ (24,782)	[1]
Other comprehensive loss, net of tax:
Unrealized (loss) gain on investments	[2]	(196)	(171)	(1,849)	296
Loss on foreign currency translation		(233)	(127)	(370)	(215)
Other comprehensive (loss) gain, net of tax		(429)	(298)	(2,219)	81
Total comprehensive loss		$ (8,490)	$ (12,015)	$ (17,684)	$ (24,701)

[1] The Statement of Cash Flows for the six months ended September 30, 2014 reflects an immaterial revision to correct outstanding payables related to purchases of property and equipment previously included in net cash used for investing activities to net cash used for operating activities. As a result, net cash used for operating activities increased by $0.3 million and net cash used for investing activities decreased by the corresponding amount.

[2] The amounts reclassified from accumulated other comprehensive loss and recorded in net realized gain on short-term investments and interest income, net in the Condensed Consolidated Statement of Operations relating to sale of short-term investments were $0.1 million and $1.5 million for the three and six months ended September 30, 2015, respectively and zero for the three and six months ended September 30, 2014. Refer to Note 2, Certain Financial Statement Information, to the Condensed Consolidated Financial Statements for additional details.