Share-Based Compensation (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Research and development	$ 836,582	$ 696,287	$ 1,342,957	$ 1,257,536
General and administrative	1,015,701	601,502	1,645,603	1,698,248
Share-based compensation expense			1,164,578	468,353
Compensation Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Research and development			465,353	92,126
General and administrative			699,225	376,227
Share-based compensation expense			$ 1,164,578	$ 468,353
Net share-based compensation expense, per common share:
Basic and diluted (in dollars per share)			$ 0.05	$ 0.03

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References+ Details