Item 2. Properties

We lease a total of approximately 120,000 square feet of office space, laboratory, warehousing and other related facilities. Approximately 90,000 of the total square footage consists of laboratory and office space for our corporate headquarters in Billerica, Massachusetts under leases expiring in 2022.

Additionally, we lease approximately 18,000 square feet of warehousing space in Billerica, Massachusetts under a lease expiring in 2019. We lease other facilities in Canada, Singapore, New York and Florida containing a total of approximately 12,000 square feet under leases expiring from July 2016 to July 2019.