Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Jun. 30, 2015
Jan. 31, 2016
Oct. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Commitments And Contingencies [Line Items]            
Operating lease rent expense       $ 964,000 $ 917,000  
Sub-lease income       100,000 91,000  
Assets acquired under capital leases         11,000  
Depreciation expense       179,000 137,000  
Capital Lease Assets            
Commitments And Contingencies [Line Items]            
Depreciation expense       31,000 17,000  
Additional Office Space            
Commitments And Contingencies [Line Items]            
Operating lease rent expense, net       5,000    
Refundable security deposit       $ 3,000    
Lease commencement date       May 01, 2014    
Lease expires       Jul. 31, 2019    
Number of rent free periods       3 months    
Office Space | Charlottesville, VA.            
Commitments And Contingencies [Line Items]            
Operating lease rent expense, net       $ 2,000    
Refundable security deposit       $ 2,000    
Lease commencement date       Jun. 30, 2015    
Lease expires       Jun. 30, 2018    
Number of rent free periods       2 months    
Office Space | Bedminster, NJ.            
Commitments And Contingencies [Line Items]            
Operating lease rent expense, net       $ 11,000    
Lease expires       Mar. 31, 2022    
Number of rent free periods       4 months    
Office Space | Princeton, NJ.            
Commitments And Contingencies [Line Items]            
Operating lease rent expense, net   $ 6,000   $ 5,000    
Lease expires   Aug. 31, 2022   Apr. 30, 2016    
Number of rent free periods   1 month        
Office Space | New York City            
Commitments And Contingencies [Line Items]            
Operating lease rent expense, net       $ 446,000    
Lease commencement date       Oct. 01, 2017    
Lease expires       Sep. 30, 2028    
Number of rent free periods       12 months    
Payments for tenant improvements       $ 2,080,000    
Office Space | Livingston, NJ            
Commitments And Contingencies [Line Items]            
Operating lease rent expense, net   $ 2,000        
Office Equipment            
Commitments And Contingencies [Line Items]            
Capital lease obligation       $ 397,000   $ 440,000
Office Equipment | Telephone System            
Commitments And Contingencies [Line Items]            
Lease expires       Nov. 30, 2018    
Assets acquired under capital leases       $ 321,000    
Capital lease, period       5 years    
Capital lease, minimum monthly payment       $ 5,000    
Office Equipment | Copier            
Commitments And Contingencies [Line Items]            
Lease expires     Oct. 31, 2018 Jun. 30, 2018    
Assets acquired under capital leases     $ 18,000 $ 21,000    
Capital lease, period     3 years 3 years    
Capital lease, minimum monthly payment     $ 1,000 $ 1,000    
Office Equipment | Jamison            
Commitments And Contingencies [Line Items]            
Assets acquired under capital leases $ 253,000          
Letter of Credit            
Commitments And Contingencies [Line Items]            
Refundable security deposit       506,000   $ 506,000
Letter of Credit | Boston landlord            
Commitments And Contingencies [Line Items]            
Refundable security deposit       80,000    
General and administrative            
Commitments And Contingencies [Line Items]            
Operating lease rent expense, net       $ 864,000 $ 826,000