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 6 Months Ended
Jun. 30, 2015
Jan. 31, 2016
Oct. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Commitments And Contingencies [Line Items]                
Operating lease rent expense       $ 923,000 $ 951,000 $ 1,887,000 $ 1,868,000  
Sub-lease income       61,000 97,000 160,000 188,000  
Assets acquired under capital leases             11,000  
Depreciation expense       190,000 137,000 368,000 274,000  
Capital Lease Assets                
Commitments And Contingencies [Line Items]                
Depreciation expense       31,000 19,000 62,000 36,000  
Additional Office Space                
Commitments And Contingencies [Line Items]                
Operating lease rent expense, net           5,000    
Refundable security deposit       3,000   $ 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   $ 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   5 months            
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       352,000   $ 352,000   $ 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   $ 506,000
Letter of Credit | Boston landlord                
Commitments And Contingencies [Line Items]                
Refundable security deposit       80,000   80,000    
General and administrative                
Commitments And Contingencies [Line Items]                
Operating lease rent expense, net       $ 862,000 $ 854,000 $ 1,727,000 $ 1,680,000