Commitments and Contingencies Lease Commitments We have commitments under operating leases for our facilities that expire on various dates through 2026, including the Waltham lease arrangement discussed in Note 2. Total lease expense, net of sublease income, for the three months ended September 30, 2017 and 2016 was $4,244 and $2,271 , respectively. We lease certain machinery and plant equipment under both capital and operating lease agreements that expire at various dates through 2027. The aggregate carrying value of the leased buildings and equipment under capital leases included in property, plant and equipment, net in our consolidated balance sheet at September 30, 2017 , is $39,072 , net of accumulated depreciation of $29,636 ; the present value of lease installments not yet due included in other current liabilities and other liabilities in our consolidated balance sheet at September 30, 2017 amounts to $37,183 . Purchase Obligations At September 30, 2017 , we had unrecorded commitments under contract of $83,919 , which were primarily composed of commitments for third-party web services of $28,180 . In addition, we had purchase commitments for production and computer equipment purchases of approximately $9,628 , inventory purchase commitments of $6,795 , commitments for advertising campaigns of $4,706 , professional and consulting fees of approximately $4,036 , and other unrecorded purchase commitments of $30,574 . Other Obligations We have an outstanding installment obligation of $5,659 related to the fiscal 2012 intra-entity transfer of the intellectual property of our subsidiary Webs, Inc., which results in tax being paid over a 7.5 year term and has been classified as a deferred tax liability in our consolidated balance sheet as of September 30, 2017 . Other obligations also include a liability related to our fiscal 2016 WIRmachenDRUCK acquisition, payable in January 2018 of $46,316 . Refer to Note 7 for additional discussion. In addition, we have deferred payments related to our other acquisitions of $4