Commitments and Contingencies - Additional Information (Detail)	12 Months Ended									1 Months Ended
	Mar. 31, 2015 USD ($) sqft	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Apr. 30, 2014 USD ($)	Apr. 30, 2015 Subsequent Event sqft	Mar. 31, 2015 For May 2014 through December 2015 USD ($)	Mar. 31, 2015 For January 2016 through February 2016 USD ($)	Mar. 31, 2015 For March 2016 through February 2018 USD ($)	Mar. 31, 2015 For March 2018 through February 2021 USD ($)	Jul. 31, 2013 Europe Lease Agreements sqft	Mar. 31, 2015 Europe Lease Agreements USD ($)	Mar. 31, 2015 Europe Lease Agreements EUR (€)
Commitments and Contingencies [Line Items]
Office space under operating lease	96,000				24,560					33,000
Facilities leases, base rent per month						$ 74,050	$ 85,818	$ 82,518	$ 85,030		$ 37,400	€ 34,500
Lease, expiration date										Jul. 31, 2023
Rent expense	1,900,000	1,500,000	1,600,000
License agreement, upfront payment				1,500,000
License agreement, maximum agreed additional payments upon achievement of development milestones				4,500,000
Payments obligations on achievement of certain development and regulatory milestones	$ 3,000,000