Other Current Liabilities - Summary of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Accrued expenses	$ 6,206	$ 6,984
Salaries, bonuses, commissions and related taxes payable	21,608	24,635
Accrued distributor commissions	10,073	9,192
Accrued legal and settlement expenses	4,196	7,673
Contingent consideration liability	13,600
Non-income taxes payable	3,638	3,180
Other payables	8,598	9,631
Other current liabilities	$ 67,919	$ 61,295