12   Commitments and Contingencies Leases. In January 2014, we entered into a non-cancelable operating lease, commencing July 1, 2014, for a new manufacturing and headquarters facility in Winter Springs, Florida owned by Susi, LLC, an entity controlled by our president, CEO and controlling stockholder, Roger Susi. Pursuant to the terms of our lease for this property, the monthly base rent is $32,583, adjusted annually for changes in the consumer price index. Under the terms of the lease, we are responsible for property taxes, insurance and maintenance expenses. The term of the lease expires on May 31, 2019. Unless advance written notice of termination is timely provided, the lease will automatically renew for two successive terms of five years each beginning in 2019 and again in 2024, and thereafter, will be renewed for successive terms of one year each. A summary of our non-cancelable operating lease commitments of June 30, 2015 is as follows: Six months ending December 31, 2015 $ 195,498 2016 390,996 2017 390,996 2018 390,996 2019 162,915 Total non-cancelable operating lease commitments $ 1,531,401 Rent expense under our operating leases was $100,361 and $31,571 for the three months ended June 30, 2015 and 2014, respectively, and $200,536 and $62,342 for the six months ended June 30, 2015 and 2014, respectively. Leasehold improvements are amortized over the shorter of the initial lease term or the estimated useful life. Purchase commitments. We had various purchase orders for goods or services totaling approximately $2,334,727 at June 30, 2015 and $1,993,801 at December 31, 2014. No amounts related to these purchase orders have been recognized in our balance sheet. Legal matters. On September 10, 2014, a Civil Action was filed in the U.S. District Court for the Southern District of Florida ( Lam Civil Action ). The Lam Civil Action was a putative class action lawsuit brought against the Company and certain individuals who are officers and / or directors of the Company. The plaintiff was an alleged shareholder o