Schedule of Gross Operating Loss Carryforwards and Tax Credit Carryforwards (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Federal research and development credits
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 6,179
Federal research and development credits | Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration date	June 2019
Federal research and development credits | Maximum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration date	June 2035
Foreign
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 2,396
Loss carryforwards	$ 9,146
Foreign | Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration date	June 2024
Loss carryforwards, expiration date	June 2016
Foreign | Maximum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration date	June 2025
Loss carryforwards, expiration date	June 2024
State
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 2,918
Loss carryforwards	$ 22,554
State | Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration date	June 2016
Loss carryforwards, expiration date	June 2017
State | Maximum
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration date	June 2034
Loss carryforwards, expiration date	June 2035
Federal
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 24,766
Federal | Minimum
Operating Loss Carryforwards [Line Items]
Loss carryforwards, expiration date	June 2027
Federal | Maximum
Operating Loss Carryforwards [Line Items]
Loss carryforwards, expiration date	June 2029