Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Taxes [Line Items]
Current deferred tax assets, net	$ 35,100		$ 35,100
Reversal of valuation	101,500
Valuation allowance	$ 2,912	$ 2,418	2,912
Stock-based compensation tax deductions in excess of book compensation expense		$ 3,567	$ 606
Earliest Tax Year
Income Taxes [Line Items]
Net operating loss carry forwards expiration period		2018
Latest Tax Year
Income Taxes [Line Items]
Net operating loss carry forwards expiration period		2034
Federal
Income Taxes [Line Items]
Net operating loss carry forwards		$ 173,200
Research and development credit carry forwards		12,400
Net operating loss carry forwards to stock-based compensation		142,000
State
Income Taxes [Line Items]
Research and development credit carry forwards		8,000
Federal Ministry of Finance, Germany
Income Taxes [Line Items]
Net operating loss carry forwards		25,000
Ministry of the Economy, Finance and Industry, France
Income Taxes [Line Items]
Net operating loss carry forwards		$ 2,400