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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Allowance for doubtful accounts $ 3,872,000 $ 5,483,000
Debt issuance cost $ 7,332  
Treasury stock, shares (in shares) 67,833  
Class A common stock    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (usd per share) $ 0.00000001 $ 0.00000001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 14,363,242 12,995,080
Common stock, shares outstanding (in shares) 14,328,538 12,995,080
Class B Common Stock    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (usd per share) $ 0.00000001 $ 0.00000001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 2,696,853 3,560,604
Common stock, shares outstanding (in shares) 2,696,853 3,560,604