For the years ended December 31, 2013 and 2012, we incurred acquisition and integration related expenses and amortization of acquired intangibles of $2.9 million and $7.9 million, respectively, related to this acquisition. The following supplemental pro forma information presents the financial results of the acquired NSN BBA business for the years ended December 31, 2012 and 2011. The pro forma results for the period January 1, 2012 to May 4, 2012 and  January 1, 2011 to December 31, 2011 are not included in our consolidated financial results.  This supplemental pro forma information does not purport to be indicative of what would have occurred had the acquisition of the NSN BBA business been completed on January 1, 2011, nor are they indicative of any future results. On August 4, 2011, we acquired all of the outstanding stock of Bluesocket, Inc., a provider of wireless network solutions  with virtual control, for $23.7 million in cash. The acquisition provides us with IEEE802.11N enterprise class wireless LAN  expertise, technology, and products to address the growing transition within small-medium enterprises and large enterprises  to wireless networks and mobile devices. We have included the financial results of Bluesocket in our consolidated financial  statements since the date of acquisition. Pro forma results of operations prior to the closing date for the acquisition have not  been presented because the effect of the acquisition was not material to our financial results. The allocation of the purchase  price to the estimated fair value of the assets acquired and liabilities assumed at the acquisition date is as follows: During the fourth quarter of 2011, the purchase price and purchase price allocation were adjusted for our final valuations. The adjustments resulted in a decrease to the goodwill recognized in the transaction. The net deferred tax assets acquired are primarily related to net operating losses and previously capitalized and unamortized research and development expense for tax deduction purposes. The fair value of the customer relationships, developed technology and intellectual property acquired was calculated using an income approach (excess earnings method) and is being amortized using the straight-line method. The customer  relationships and intellectual property are being amortized over an estimated useful life of 7 years and the developed technology is being amortized over an average estimated useful life of 4.5 years. ADTRAN 2013 Annual Report 48 (In thousands) (Unaudited) 2012 2011 Pro forma revenue $119,600 $196,256 Pro forma pre-tax loss $(23,621) $(36,980) Weighted average exchange rate during the period (EURO/USD) € 1.00/$1.29 € 1.00/$1.38 (In thousands) Cash $1,027 Accounts receivable 298 Inventory 792 Prepaid expenses 357 Property, plant and equipment 173 Deferred tax assets, net 12,962 Accounts payable (441) Unearned revenue (600) Accrued expenses (332) Net assets acquired 14,236 Customer relationships 1,530 Developed technology 3,230 Intellectual property 930 Trade names 270 Goodwill 3,492 Total purchase price $23,688