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 6 Months Ended
Mar. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Commitments And Contingencies [Line Items]            
Operating lease rent expense   $ 951,000 $ 897,000 $ 1,868,000 $ 1,798,000  
Sub-lease income   97,000 95,000 188,000 196,000  
Asset acquired under capital lease       11,000 289,000  
Depreciation expense   137,000 142,000 274,000 263,000  
Contingent consideration payments         1,679,000  
Capital Lease Assets            
Commitments And Contingencies [Line Items]            
Depreciation expense   19,000 21,000 $ 36,000 40,000  
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]            
Lease expires       Nov. 30, 2018    
Capital lease obligation   508,000   $ 508,000   $ 282,000
Asset acquired under capital lease       $ 321,000    
Capital lease, period       5 years    
Capital lease, minimum monthly payment       $ 5,000    
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   $ 854,000 $ 802,000 $ 1,680,000 $ 1,602,000