Annual report pursuant to Section 13 and 15(d)

Commitments - Additional Information (Detail)

v3.2.0.727
Commitments - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Operating Leased Assets [Line Items]      
Rent expenses under operating leases   $ 280,606 $ 371,069
Letter Of Credit [Member]      
Operating Leased Assets [Line Items]      
Security deposit   $ 66,000  
Office And Laboratory Space [Member]      
Operating Leased Assets [Line Items]      
Lease termination date Jan. 31, 2019    
Laboratory Space [Member]      
Operating Leased Assets [Line Items]      
Lease termination period   2013-12  
Office Space [Member]      
Operating Leased Assets [Line Items]      
Lease expiration period   2017-03