Concentration of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total Revenue | One Customer
Concentration Risk [Line Items]
Risk concentration	28.00%	27.00%	28.00%
Customer Concentration | Accounts Receivable | One Customer
Concentration Risk [Line Items]
Risk concentration	11.00%	10.00%
Customer Concentration | Total Revenue | Customer A
Concentration Risk [Line Items]
Risk concentration			18.00%
Customer Concentration | Total Revenue | Customer B
Concentration Risk [Line Items]
Risk concentration			13.00%
Financial Institution A | Concentration of Credit Risk | Cash and Cash Equivalents
Concentration Risk [Line Items]
Risk concentration	73.00%	46.00%
Financial Institution B | Concentration of Credit Risk | Cash and Cash Equivalents
Concentration Risk [Line Items]
Risk concentration	18.00%	43.00%