The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Number of new stock issued during the period.

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Equity Investment - Additional Information (Detail) £ in Thousands, $ in Thousands		1 Months Ended		6 Months Ended
	Mar. 25, 2013 USD ($)	Feb. 28, 2014 USD ($) shares	Feb. 28, 2014 GBP (£) shares	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Equity Method Investments [Line Items]
Equity investment	$ 3,687
Gain on dilution of equity method investment					$ 256
Equity investment ownership position	29.27%			21.18%
Loss from equity method investment				$ (191)	$ (396)
Carrying value of equity investment				2,981
Quoted market value of equity investment				$ 4,148
TyraTech Inc.
Equity Method Investments [Line Items]
Shares issued by equity investee \| shares		37,391,763	37,391,763
Amount raised by equity investee on shares issued		$ 3,100	£ 1,870