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Operating Leases - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Operating Leased Assets [Line Items]          
Deferred rent related to lease $ 38,327   $ 38,327   $ 97,012
Deferred rent related to lease 28,155   $ 28,155    
Gaithersburg, Maryland [Member]          
Operating Leased Assets [Line Items]          
Period of operating lease     5 years    
Deferred rent related to lease $ 38,327   $ 38,327   $ 97,012
Lease expiration date     2015-10    
Rockville, Maryland [Member]          
Operating Leased Assets [Line Items]          
Period of operating lease     8 years    
Total rental space | ft² 33,843   33,843    
Lease commencement date     Nov. 01, 2015    
Annual base rent $ 607,500   $ 607,500    
Deferred rent related to lease 28,155   28,155    
Operating leases, rent expense $ 123,962 $ 96,554 $ 220,360 $ 192,871