For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Significant Retailer Concentrations (Details) - Customer concentration risk - Walmart	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Percent of total operating revenues
Concentration Risk [Line Items]
Concentration risk, percentage	27.00%	35.00%	27.00%	33.00%
Settlement assets
Concentration Risk [Line Items]
Concentration risk, percentage					13.00%