Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss		$ (8,199)	$ (12,131)	$ (23,664)	$ (36,913)	[1]
Other comprehensive loss, net of tax:
Unrealized gain (loss) on investments	[2]	(263)	(78)	(2,112)	218
Loss on foreign currency translation		(63)	(159)	(433)	(374)
Other comprehensive loss, net of tax		(326)	(237)	(2,545)	(156)
Total comprehensive loss		$ (8,525)	$ (12,368)	$ (26,209)	$ (37,069)

[1] The Statement of Cash Flows for the nine months ended December 31, 2014 reflects immaterial revisions to correct $0.3 million of 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 and $0.1 million of net realized gains on short-term investments previously classified as net cash used for operating activities to net cash provided by investing activities. As a result, net cash used for operating activities increased by $0.4 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 zero and $1.5 million for the three and nine months ended December 31, 2015, respectively, and $0.1 million each for the three and nine months ended December 31, 2014. Refer to Note 2, Certain Financial Statement Information, to the Condensed Consolidated Financial Statements for additional details.