SETTLEMENT ASSETS AND OBLIGATIONS (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Merchant reserves held by sponsor banks	$ 71,700	$ 79,800
Settlement assets	456	533
Settlement obligations	30,665	37,789
Card settlements due to merchants
Accounts, Notes, Loans and Financing Receivable [Line Items]
Settlement obligations	22	44
Due to ACH payees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Settlement obligations	30,643	37,745
Card settlements due from merchants, net of estimated losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Settlement assets	195	446
Card settlements due from processors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Settlement assets	$ 261	$ 87