Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2015
Jun. 30, 2015
Mar. 30, 2015
Sep. 30, 2016
Jan. 31, 2016
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments And Contingencies [Line Items]                  
Operating lease rent expense             $ 3,760,000 $ 3,766,000 $ 3,667,000
Sub-lease income             289,000 433,000 379,000
Assets acquired under capital leases               50,000 321,000
Depreciation and amortization             737,000 719,000 546,000
Contingent consideration payments                 1,805,000
Payments recorded as compensation expense             10,000 3,000  
Capital Lease Assets                  
Commitments And Contingencies [Line Items]                  
Depreciation and amortization             $ 124,000 123,000 81,000
Jamison                  
Commitments And Contingencies [Line Items]                  
Contingent consideration payments     $ 3,550,000            
MCG Acquisition | Contingent Consideration                  
Commitments And Contingencies [Line Items]                  
Contingent consideration percentage of EBITDA             22.00%    
Number of years contingent consideration adjusted annual EBITDA             5 years    
Contingent consideration payments           $ 1,805,000 $ 0 0  
Additional Office Space                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net       $ 10,000     5,000    
Refundable security deposit             $ 3,000    
Lease commencement date       Oct. 01, 2017     May 01, 2014    
Lease expires       Nov. 30, 2024     Jul. 31, 2019    
Number of rent free periods             3 months    
Rent credit       $ 40,000,000          
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         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             $ 267,000 440,000  
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             506,000 587,000  
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             $ 3,471,000 $ 3,333,000 $ 3,288,000