Customer Concentration (Tables)

9 Months Ended

Sep. 30, 2019

Risks and Uncertainties [Abstract]

Schedule of Revenue and Accounts Receivable by Major Customers

The following table shows customers with revenues of 10% or greater of total revenues from external customers and customers with accounts receivable balances of 10% or greater of total accounts receivable from external customers:

	Percentage of Total Revenues from External Customers				Percentage of Accounts Receivable from External Customers
	Three Months Ended September 30,		Nine Months Ended September 30,		September 30,	December 31,
	2019	2018	2019	2018	2019	2018
Customer A	14%	17%	17%	18%	11%	21%
Customer B	10%	15%	11%	15%	*	14%
Customer C	13%	15%	12%	20%	*	18%
Customer D	10%	18%	12%	13%	11%	*
Customer E	*	*	*	*	11%	*

* Less than 10%