Commitments and Contingencies

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies

Commitments and Contingencies

10. Commitments and Contingencies

Operating leases

The Company leases its office, laboratory and manufacturing space under non-cancellable operating leases. In March 2013 and September 2013, the Company entered into facility lease amendments to further expand its office, laboratory and manufacturing space. The amendments leased additional space, which is co-terminus with the existing lease. The aggregate additional rent due over the term of the lease as a result of the amendments is approximately $3.5 million.

As part of these amendments, the landlord agreed to reimburse the Company for an additional portion of tenant improvements made to the facility, up to a total of $1.1 million. Aggregate landlord reimbursable tenant improvements outstanding under the existing lease and the lease amendments as of September 30, 2013 is $5.3 million, which are recorded within other current assets on the condensed consolidated balance sheets.