Commitments and Contingencies

6 Months Ended

Jun. 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. During March 2013, the Company entered into a facility lease amendment to further expand its office, laboratory and manufacturing space. The amendment leased additional space effective March 2013 and is co-terminus with the existing lease. The aggregate additional rent due over the term of the lease amendment is approximately $2.6 million. As part of this amendment, the landlord agreed to reimburse the Company for an additional portion of tenant improvements made to the facility, up to a total of $0.6 million. Aggregate landlord reimbursable tenant improvements outstanding under the existing lease and the lease amendment as of June 30, 2013 is $4.8 million, which are recorded within other current assets on the condensed consolidated balance sheets.