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Revenues - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accrued sales returns included in accrued expenses and other current liabilities	$ 17,437	$ 17,437
Accrued sales incentives included in accrued expenses and other current liabilities	$ 11,600	$ 11,600	$ 13,001
Product Concentration Risk | Total Service Revenue | Maximum
Total service revenue as percentage of consolidated revenues	1.00%	1.00%

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