Accrued Expenses and Other Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accrued Expenses and Other Liabilities
Accrued payroll and related items	$ 3,304	$ 4,769
Artist payables	4,483	5,528
Accrued product costs	1,452	3,008
Operating lease liabilities	1,608
Contingent liabilities	1,071	1,082
Accrued post-combination compensation		1,819
Other	5,471	5,943
Accrued expenses and other current liabilities	$ 17,389	$ 22,149