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Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
May 15, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]            
Borrowings under credit facilities       $ 50,620,988 $ 6,000,000  
Debt outstanding   $ 35,400,000   35,400,000   $ 0
Unamortized debt issuance cost   200,000   200,000    
Interest expense and fees   300,000 $ 100,000 700,000 300,000  
Amortization of debt issuance costs   100,000 $ 300,000 200,000 $ 300,000  
Other Assets            
Debt Instrument [Line Items]            
Financing costs capitalized   700,000   700,000    
Term Loans            
Debt Instrument [Line Items]            
Debt outstanding   18,800,000   18,800,000    
Revolving Loan            
Debt Instrument [Line Items]            
Debt outstanding   16,600,000   16,600,000    
Maximum            
Debt Instrument [Line Items]            
Financing costs capitalized   200,000   200,000    
New Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 90,000,000          
Line of credit facility, maturity date May 15, 2024          
Amortization of debt issuance costs       1,100,000    
New Credit Facility | Other Assets            
Debt Instrument [Line Items]            
Financing costs capitalized   700,000   700,000    
New Credit Facility | Term Loans            
Debt Instrument [Line Items]            
Financing costs capitalized   $ 400,000   $ 400,000    
New Credit Facility | Maximum            
Debt Instrument [Line Items]            
Increase in credit facility $ 75,000,000.0          
New Credit Facility | Maximum | Base Rate            
Debt Instrument [Line Items]            
Line of credit facility, applicable margin 1.00%          
New Credit Facility | Maximum | LIBOR            
Debt Instrument [Line Items]            
Line of credit facility, applicable margin 2.00%          
New Credit Facility | Minimum | Base Rate            
Debt Instrument [Line Items]            
Line of credit facility, applicable margin 0.50%          
New Credit Facility | Minimum | LIBOR            
Debt Instrument [Line Items]            
Line of credit facility, applicable margin 1.50%          
Delayed Draw Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 55,000,000.0          
Line of credit facility, frequency of payment and payment terms       Commencing on June 30, 2021, the amount of any outstanding Draw Term Loans shall be repayable in equal consecutive quarterly installments equal to 1/28th of the outstanding Draw Term Loans and the remainder shall be due and payable on May 15, 2024.    
Line of credit facility, frequency of payments       quarterly    
Line of credit facility, date of first required payment Jun. 30, 2021          
Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 35,000,000.0          
Borrowings under credit facilities 15,000,000.0          
Line of credit facility, remaining borrowing capacity $ 20,000,000.0