Revenue Recognition - Additional Information (Details)	9 Months Ended
	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Discount percentage	2.00%
Standard payment term	30 days
Percentage of discount accrued at time of sale	100.00%
GPO billing period	30 days
Minimum
Disaggregation of Revenue [Line Items]
Rebate payment term	1 month
Product return term	3 years
Maximum
Disaggregation of Revenue [Line Items]
Rebate payment term	3 months
Product return term	5 years