Accounts Receivable, Net and Revenue Concentrations - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Trade receivables, gross	$ 151,220	$ 133,774
Allowance for doubtful accounts	(1,292)	(1,121)	$ (992)	$ (1,064)
Allowance for sales returns	(497)	(731)
Net trade receivables	149,431	131,922
Other	7,707	12,767
Accounts receivable, net	$ 157,138	$ 144,689

Allowance for sales returns.

No definition available.

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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