Nature of the Business and Operations and Liquidity - Additional Information (Detail) $ in Thousands				3 Months Ended			39 Months Ended
	Apr. 29, 2015 USD ($)	Mar. 24, 2015	Nov. 13, 2014 USD ($)	Jun. 30, 2015 USD ($) Employee	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Employee	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)
Description Of Business [Line Items]
Reverse stock split		0.1
Accumulated deficit				$ (914,166)			$ (914,166)	$ (905,045)
Cash and cash equivalents				38,561		$ 36,624	$ 38,561	$ 20,490	$ 43,114
Net cash used in operating activities				$ 3,035		5,506
Number of workforce persons | Employee				308			308
Cash flows from financing activities				$ 21,183		$ (633)	$ 74,000
Proceeds from additional equity offering	$ 22,300		$ 9,100
Tres Amigas
Description Of Business [Line Items]
Impairment charge on investment				$ 746
Blade Dynamics Ltd
Description Of Business [Line Items]
Impairment charge on investment					$ 3,500