NOTE 11  COMMITMENTS AND CONTINGENCIES (a) Lease Commitments We lease office and operating facilities and equipment under non-cancelable operating leases. Current facility leases include our headquarters in Englewood, Colorado, Durham, North Carolina, London and Bath, England, Bangalore and Kolkata, India, Kuala Lumpur, Malaysia and Bucharest, Romania. Rent expense was $ 0.6 million, $ 0.6 million and $ 0.4 million for the years ended December 31, 2015, 2014 and 2013, respectively. Rent expense is net of sublease rental income. There were was no sublease rental income for the years ended December 31, 2015, 2014 and 2013. Our headquarters facility lease extends for the term through November 30, 2017. The lease contains a clause that adjusts the lease rate every year. The lease rate increases annually as of December 1. Our London, England facility contains a clause which gives us six months free rent over the five year term. We account for the effect of such escalating lease payments as if the lease rate were consistent over the lease term. Future minimum commitments under non-cancelable operating leases and capital leases gross of sublease payments as of December 31, 2015 are as follows (in thousands): Operating Leases Capital Leases 2016 $ 656 $ 6 2017 626 1 2018 438 - 2019 243 - 2020 56 - Total minimum lease payments $ 2,019 7 Less: Amount representing interest (1) Principal balance of capital lease obligations 6 Less: Current portion of capital lease obligations (5) Long-term portion of capital lease obligations $ 1 (b) Other Commitments As permitted under Delaware law, we have agreements with officers and directors under which we agree to indemnify them for certain events or occurrences while the officer or director is, or was, serving at our request in this capacity. The term of the indemnification period is indefinite. There is no limit on the amount of future payments we could be required to make under these indemnification agreements; however, we maintain Director and Officer insurance policies, as well a