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Debt, Commitments and Contingencies - Debt (Details)
3 Months Ended 9 Months Ended
Mar. 25, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Oct. 21, 2019
USD ($)
Oct. 06, 2017
USD ($)
Debt Instrument [Line Items]                
Proceeds from line of credit       $ 50,000,000 $ 0      
Repayments of lines of credit       2,000,000 3,000,000      
Contingent consideration liability from acquisitions   $ 0   0   $ 2,595,000    
Increase (decrease) in fair value of contingent liability       (2,593,000) 0      
Revolving Credit Facility | 2017 Facility                
Debt Instrument [Line Items]                
Proceeds from line of credit $ 50,000,000.0              
Repayments of lines of credit   1,000,000.0 $ 1,000,000.0 2,000,000.0 $ 3,000,000.0      
Revolving Credit Facility | Line of Credit | 2017 Facility                
Debt Instrument [Line Items]                
Current borrowing capacity               $ 125,000,000.0
Long-term debt   $ 111,000,000.0   $ 111,000,000.0   63,000,000.0   72,000,000.0
Maximum borrowing capacity               $ 175,000,000.0
Effective interest rate (percent)       2.92% 4.61%      
Unused line commitment fee (percentage)       0.20%        
Consolidated leverage ratio covenant (not to exceed)   3.25   3.25        
Consolidated fixed charge coverage ratio covenant (at least)       1.25        
Revolving Credit Facility | Line of Credit | 2017 Facility | Federal Funds Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)       0.50%        
Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)       1.00%        
Scenario One, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Interest rate terms, leverage ratio   1.00   1.00        
Scenario Two, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Minimum                
Debt Instrument [Line Items]                
Interest rate terms, leverage ratio   1.00   1.00        
Scenario Two, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Maximum                
Debt Instrument [Line Items]                
Interest rate terms, leverage ratio   2.00   2.00        
Scenario Three, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Minimum                
Debt Instrument [Line Items]                
Interest rate terms, leverage ratio   2.00   2.00        
Scenario Three, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Maximum                
Debt Instrument [Line Items]                
Interest rate terms, leverage ratio   3.00   3.00        
Scenario Four, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Maximum                
Debt Instrument [Line Items]                
Interest rate terms, leverage ratio   3.00   3.00        
Less than 1.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)   1.50%   1.50%        
Greater than or equal to 1.00 but less than 2.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)   1.75%   1.75%        
Greater Than Or Equal To 2.00 But Less Than 3.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)   2.00%   2.00%        
Greater Than Or Equal To 3.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)   2.50%   2.50%        
Fair Value, Measurements, Recurring                
Debt Instrument [Line Items]                
Contingent consideration liability from acquisitions   $ 2,000   $ 2,000   $ 2,595,000    
OpenEye                
Debt Instrument [Line Items]                
Percentage of business acquired             85.00%  
Additional earn-out             $ 11,000,000.0  
Increase (decrease) in fair value of contingent liability       (2,600,000)        
OpenEye | Fair Value, Measurements, Recurring                
Debt Instrument [Line Items]                
Contingent consideration liability from acquisitions   $ 100,000   $ 100,000     $ 2,800,000