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Accrued Expenses and Other Liabilities - Contingent Consideration (Details)
$ in Thousands
1 Months Ended 9 Months Ended
May 01, 2017
USD ($)
installment
May 31, 2019
USD ($)
May 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Contingent consideration          
Cash paid for contingent consideration liability   $ 1,200 $ 1,100 $ 934 $ 905
Deny Designs          
Contingent consideration          
Maximum contingent consideration $ 3,600        
Number of annual installments | installment 3        
Contingent consideration $ 2,800        
Cash paid for contingent consideration liability   $ 1,200 $ 1,100