Commitments and Contingencies

9 Months Ended

Sep. 30, 2011

Commitments and Contingencies [Abstract]

Commitments and Contingencies

9. Commitments and Contingencies

We recognize and disclose commitments when we enter into executed contractual obligations with third parties. We accrue contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated.

License Agreements

The Company has entered into license agreements (the “Harvard License Agreements”) with Harvard University and its affiliated hospitals (“Harvard and its Affiliates”) to acquire the exclusive worldwide rights to certain technologies within its molecular imaging and neurodegenerative disease programs. The Harvard License Agreements obligate the Company to pay up to an aggregate of approximately $850,000 in milestone payments in the future. The future milestone payments are generally payable only upon achievement of certain regulatory milestones.

The Company’s license agreements with Harvard and its Affiliates generally provide for royalty payments equal to specified percentages of product sales, annual license maintenance fees and continuing patent prosecution costs.