Commitments and Contingencies Facilities Lease As of September 30, 2014 , the Company leases 132,176 square feet for its corporate headquarters in Sunnyvale, California. Of this total space, 79,776 square feet are leased under an operating lease that expires in November 2017 , with an option to extend the lease term for an additional five years. The remaining 52,400 square feet, of which 32,000 square feet represents additional space that the Company exercised an option to lease during the year ended December 31, 2013 , is leased under an operating lease which expires in February 2023 , which provides for an option to early terminate the lease in 2018 and an option to extend the lease term for an additional five years. In addition, the Company leases approximately 8,000 square feet for its Pharmacyclics Switzerland GmbH office under an agreement that expires in May 2015. During the year ended December 31, 2013 , the Company entered into an agreement to lease 7,000 square feet of office space in South San Francisco, California under an operating lease which expired in September 2014 and was amended to extend the lease until December 2014. The Company recognizes rental expense on the facilities on a straight-line basis over the lease term. Differences between the straight line rent expense and rent payments are classified as deferred rent liability on the balance sheet. As of September 30, 2014 , the Company's future minimum lease payments under non-cancelable operating leases are as follows (in thousands): Fiscal year Operating Lease Commitments 2014 (remaining three months) $ 627 2015 2,197 2016 2,161 2017 2,112 2018 857 2019 882 Thereafter 2,890 Total $ 11,726 Purchase Commitments The Company had non-cancelable purchase obligations for approximately $91.2 million and $34.8 million as of September 30, 2014 and December 31, 2013 , respectively. Excess Amounts under collaboration and license agreement with Janssen The Company's worldwide collaboration and license agreement with Janssen provides the Company with an