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 ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Mar. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Commitments And Contingencies [Line Items]              
Operating lease rent expense     $ 949,000 $ 938,000 $ 2,817,000 $ 2,736,000  
Sub-lease income     96,000 91,000 284,000 287,000  
Asset acquired under capital lease         32,000 321,000  
Depreciation expense     270,000 147,000 544,000 410,000  
Contingent consideration payments           1,679,000  
Capital Lease Assets              
Commitments And Contingencies [Line Items]              
Depreciation expense     46,000 20,000 $ 82,000 60,000  
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         $ 0 1,679,000  
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         Jul. 30, 2015    
Lease expires         Jul. 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         Nov. 01, 2016    
Office Space | Princeton, NJ.              
Commitments And Contingencies [Line Items]              
Operating lease rent expense, net         $ 5,000    
Lease expires         Mar. 01, 2016    
Office Equipment              
Commitments And Contingencies [Line Items]              
Capital lease obligation     468,000   $ 468,000   $ 282,000
Office Equipment | Telephone System              
Commitments And Contingencies [Line Items]              
Lease expires         Nov. 30, 2018    
Asset acquired under capital lease         $ 321,000    
Capital lease, period         5 years    
Capital lease, minimum monthly payment         $ 5,000    
Office Equipment | Copier              
Commitments And Contingencies [Line Items]              
Lease expires         Jun. 30, 2018    
Asset acquired under capital lease         $ 21,000    
Capital lease, period         3 years    
Capital lease, minimum monthly payment         $ 1,000    
Office Equipment | Jamison              
Commitments And Contingencies [Line Items]              
Asset acquired under capital lease $ 253,000            
Letter of Credit              
Commitments And Contingencies [Line Items]              
Refundable security deposit     586,000   586,000   $ 586,000
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     $ 853,000 $ 847,000 $ 2,533,000 $ 2,449,000