Note 18. Operating Segments and Geographic Information Our chief executive officer is our Chief Operating Decision Maker (CODM). The CODM allocates resources to the segments based on their business prospects, competitive factors, net revenue and gross margin. We do not track all of our property, plant and equipment by operating segments. The geographic identification of these assets is set forth below. We are an industry leading provider of optical and photonic products defined by revenue and market share addressing a range of end-market applications including optical communications and commercial lasers. We have two operating segments, Optical Communications, which we refer to as OpComms, and Commercial Lasers, which we refer to as Lasers. Our OpComms products address the following markets: telecommunications and data communications (Telecom and Datacom), and consumer and industrial (Consumer and Industrial), and include product lines from the recent acquisition of Oclaro. The two operating segments were primarily determined based on how the CODM views and evaluates our operations. Operating results are regularly reviewed by the CODM to make decisions about resources to be allocated to the segments and to assess their performance. Other factors, including market separation and customer specific applications, go-to-market channels, products and manufacturing, are considered in determining the formation of these operating segments. We do not allocate research and development, sales and marketing, or general and administrative expenses to our segments because management does not include the information in its measurement of the performance of the operating segments. In addition, we do not allocate amortization and impairment of acquisition-related intangible assets, stock-based compensation and certain other charges impacting the gross margin of each segment because management does not include this information in its measurement of the performance of the operating segments. Information on reportable segments utilized by our CODM is as follows ( in millions) : Three Months Ended September 28, 2019 September 29, 2018 Net revenue: OpComms $ 416.1 $ 310.1 Lasers 33.8 44.0 Net revenue $ 449.9 $ 354.1 Gross profit: OpComms $ 191.9 $ 124.9 Lasers 14.2 17.7 Total segment gross profit 206.1 142.6 Unallocated corporate items: Stock-based compensation (4.2 ) (3.3 ) Amortization of acquired intangibles (12.5 ) (0.8 ) Amortization of fair value adjustments (2.2 )  Inventory write down due to product lines exit (1.1 )  Integration related costs (3.4 )  Other charges (1) (15.0 ) (12.5 ) Gross profit $ 167.7 $ 126.0 (1) Other charges of unallocated corporate items for the three months ended September 28, 2019 primarily include costs of transferring product lines to Thailand of $4.8 million as well as excess and obsolete charges driven by the decline in demand by Huawei of $6.7 million . During the three months ended September 29, 2018 , other charges of unallocated corporate items primarily consisted of set-up costs of our facility in Thailand, including costs of transferring product lines to Thailand of $12.7 million . Disaggregation of Revenue We disaggregate revenue by product and by geography. We do not present other levels of disaggregation, such as by type of products, customer, markets, contracts, duration of contracts, timing of transfer of control and sales channels, as this information is not used by our CODM to manage the business. The table below discloses our total net revenue attributable to each of our two reportable segments. In addition, it discloses the percentage of our total net revenue attributable to our product offerings which serve Telecom and Datacom, and Consumer and Industrial markets which accounted for 10% or more of our total net revenue during the periods presented ( in millions, except percentage data ): Three Months Ended September 28, 2019 September 29, 2018 OpComms: Telecom and Datacom $ 248.1 55.2 % $ 177.1 50.0 % Consumer and Industrial 168.0 37.3 % 133.0 37.6 % Total OpComms $ 416.1 92.5 % $ 310.1 87.6 % Lasers 33.8 7.5 % 44.0 12.4 % Total Revenue $ 449.9 $ 354.1 We operate in three geographic regions: Americas, Asia-Pacific, and EMEA (Europe, Middle East, and Africa). Net revenue is assigned to the geographic region and country where our product is initially shipped. For example, certain customers may request shipment of our product to a contract manufacturer in one country, which may differ from the location of their end customers. The following table presents net revenue by the three geographic regions we operate in and net revenue from countries that represented 10% or more of our total net revenue (in millions, except percentage data): Three Months Ended September 28, 2019 September 29, 2018 Amount % of Total Amount % of Total Americas: United States $ 36.9 8.3 % $ 21.9 6.2 % Mexico 28.9 6.4 56.3 15.9 Other Americas 1.1 0.2 0.9 0.3 Total Americas $ 66.9 14.9 % $ 79.1 22.4 % Asia-Pacific: Hong Kong $ 133.8 29.7 % $ 65.5 18.5 % South Korea 91.6 20.4 70.0 19.8 Japan 32.5 7.2 36.1 10.2 Other Asia-Pacific 92.8 20.6 74.1 20.9 Total Asia-Pacific $ 350.7 77.9 % $ 245.7 69.4 % EMEA $ 32.3 7.2 % $ 29.3 8.2 % Total net revenue $ 449.9 $ 354.1 During the three months ended September 28, 2019 and September 29, 2018 , net revenue from customers outside the United States, based on customer shipping location, represented 91.7% and 93.8% of net revenue, respectively. Our net revenue from Hong Kong grew due to increased sales of our 3D sensing products for mobile devices shipped to one of our large customers. Transaction Price Allocated to the Remaining Performance Obligations The following table includes estimated revenue expected to be recognized in the future for backlog related performance obligations that are unsatisfied as of September 28, 2019 ( in millions ): Less than 1 year 1-2 years Greater than 2 years Total Performance obligations $414.9 $ $ $414.9 Contract Balances The following table reflects the changes in contract balances as of September 28, 2019 ( in millions, except percentages ): Contract balances Balance sheet location September 28, 2019 June 29, 2019 Change Percentage Change Accounts receivable, net Accounts receivable, net $292.8 $238.0 $54.8 23.0% Deferred revenue and customer deposits Other current liabilities $2.5 $2.9 $(0.4) (13.8)% During the three months ended September 28, 2019 and September 29, 2018 , our net revenue was concentrated with three customers, who collectively accounted for 58% and 59% of our total net revenue, respectively. As of September 28, 2019 and June 29, 2019 , our accounts receivable balance was concentrated with three customers, who collectively represented 49% and 44% of gross accounts receivable, respectively. Long-lived assets, namely net property, plant and equipment, net, were identified based on the physical location of the assets in the corresponding geographic areas as of the periods indicated (in millions) : September 28, 2019 June 29, 2019 Property, plant and equipment, net United States $ 155.9 $ 156.2 Thailand 144.1 157.1 China 51.9 33.5 Japan 28.3 28.3 Other countries 56.5 58.2 Total long-lived assets $ 436.7 $ 433.3 We purchase a substantial portion of our inventory from contract manufacturers and vendors located primarily in Taiwan, Thailand, and Malaysia. During the three months ended September 28, 2019 and September 29, 2018 , net inventory purchases were concentrated with two contract manufacturers, who collectively accounted for 79% and 77% of total net inventory purchases, respectively.