Certain Financial Statement Information - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	[1]	$ 115,038
Other comprehensive loss, net of tax		2	$ (1,790)
Ending Balance		110,931
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		(2,486)
Other comprehensive loss, net of tax		(145)
Ending Balance		(2,631)
Unrealized loss on short-term investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		(7,067)
Other comprehensive loss, net of tax		147
Ending Balance		(6,920)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		(9,553)
Other comprehensive loss, net of tax		2
Ending Balance		$ (9,551)

[1] The Condensed Consolidated Balance Sheet as of March 31, 2016 has been derived from the audited Consolidated Financial Statements at that date but does not include all disclosures required by generally accepted accounting principles for complete financial statements.