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Debt - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Oct. 31, 2018
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity         $ 49,000,000.0     $ 49,000,000.0  
Net proceeds       $ 50,000,000.0          
Adjusted quick ratio   1.75       1.30      
Adjusted quick ratio to maintain to reduce frequency of providing financial information   2.50              
Proceeds from borrowings on debt $ 25,000,000.0 $ 25,000,000.0           50,000,000 $ 15,000,000
Repayment of debt               53,786,000 $ 0
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity         25,000,000.0     25,000,000.0  
First Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, face amount         15,000,000.0     15,000,000.0  
Repayment of debt         1,300,000     $ 2,500,000  
First Term Loan | Prime Rate                  
Debt Instrument [Line Items]                  
Debt, variable rate               0.25%  
Second Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, face amount         9,000,000.0     $ 9,000,000.0  
Repayment of debt         $ 600,000     $ 1,300,000  
Second Term Loan | Prime Rate                  
Debt Instrument [Line Items]                  
Debt, variable rate     25.00% 5.25%     0.25%   525.00%