Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Summary of Significant Accounting Policies [Abstract]

Estimated Useful Life of Property and Equipment

Property and equipment are depreciated using the straight-line method over the estimated useful lives of the respective assets as follows:

Asset Category	Estimated Useful Life (in Years)
Leasehold improvements	8 - 10
Furniture and office equipment	5
Computer and other equipment	3 - 5

Schedule of Share-based Compensation Expense

Share-based compensation expense for 2013, 2012 and 2011 is as follows:

	Year ended December 31,
	2013		2012		2011
Research and development	$	333,735	$	518,375	$	754,554
General and administrative		1,028,981		1,375,724		1,811,407
Total share-based compensation expense	$	1,362,716	$	1,894,099	$	2,565,961