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Purchase Price of Acquisition (Detail) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Business Acquisition [Line Items]  
Cash $ 61,302
Share consideration issued [1] 8,382
Value of contingent consideration [2] 2,488
Working capital adjustment [3] 374
Total purchase price $ 72,546
[1] Share consideration issued is valued at the closing market price discounted to account for lack of marketability related to the lock up period as described in the share purchase agreement.
[2] The value of contingent consideration represents the present value of the estimated payments related to the attainment of certain financial targets for the years 2014 through 2016, determined as of the date of the acquisition. The maximum undiscounted contingent consideration to be paid under the agreement is £5.5 million ($9.0 million).
[3] A working capital adjustment was made in May 2014 as provided for in the share purchase agreement.