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Australia Research and Development Tax Incentive - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Percentage of refundable tax incentive			45.00%
Reduction to research and development expenses	$ 458	$ 47	$ 687	$ 73
Unrealized foreign currency transaction gains (losses)			$ (38)	64
Australia [Member]
Operating Loss Carryforwards [Line Items]
Percentage of reduction in research and development costs			45.00%
Tax incentive receivable	1,040		$ 1,040		$ 391
Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Unrealized foreign currency transaction gains (losses)	$ (14)	$ 22	$ (38)	$ 64

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- Definition

Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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Percentage of research and development costs eligible to be refunded as part of tax incentive program.

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