Commitments (Details Textual) (USD $)	1 Months Ended	3 Months Ended			6 Months Ended
	Jan. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Medford [Member] sqft	Jun. 30, 2012 Cambridge [Member] Option	Nov. 29, 2011 Cambridge [Member] sqft	Jun. 30, 2012 Standby Letters of Credit [Member]
Operating Leased Assets [Line Items]
Lease Space for Laboratory and office space							1,597		20,917
Monthly lease cost							$ 5,476
Expiration period of the lease							Nov. 15, 2012
Term of commercial lease								6 years 3 months
Lease extension option								5 years
Standby letter of credit										295,000
Number of extension option								1
Total rent expense		114,000		84,000	215,000	207,000
Other Commitments (Textual) [Abstract]
Amount paid for pre-clinical study	150,000
Pre-clinical study , initial payment		0	60,000
Cost of Research and Development			$ 60,000