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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2020
May 20, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]      
Allowance for doubtful accounts $ 6,392   $ 5,197
Debt issuance costs $ 4,445   $ 5,007
Common stock, shares issued (in shares) 20,521,220    
Common stock, shares outstanding (in shares) 20,346,998    
Treasury stock, shares (in shares) 174,222   68,658
Class A Common Stock      
Condensed Financial Statements, Captions [Line Items]      
Common stock, par value (usd per share) $ 0.0000001 $ 0.0000001 $ 0.0000001
Common stock, shares authorized (in shares) 100,000,000   100,000,000
Common stock, shares issued (in shares) 18,104,967   15,750,097
Common stock, shares outstanding (in shares) 17,930,745   15,681,439
Class B Common Stock      
Condensed Financial Statements, Captions [Line Items]      
Common stock, par value (usd per share) $ 0.0000001 $ 0.0000001 $ 0.0000001
Common stock, shares authorized (in shares) 100,000,000   100,000,000
Common stock, shares issued (in shares) 2,416,253   1,926,848
Common stock, shares outstanding (in shares) 2,416,253   1,926,848
6.75% Senior Notes      
Condensed Financial Statements, Captions [Line Items]      
Debt issuance costs $ 6,289   $ 6,938
Interest rate 6.75%   6.75%