Preliminary Estimated Fair Values of the Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jul. 01, 2014	Mar. 31, 2014
Acquired assets:
Cash and cash equivalents		$ 53
Accounts receivable		25
Property and equipment		619
In-process research and development		18,500
Goodwill	36,867	1,964	37,990
Long-term deferred tax assets	813	874
Other assets acquired		141
Total assets acquired		22,176
Liabilities assumed:
Accounts payable		295
Accrued liabilities		131
Total liabilities assumed		426
Net assets acquired		$ 21,750