Related Party Transactions - Related party balances (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Related party balances:
Receivables from sale of POS devices and peripherals	$ 1,447		$ 1,447		$ 1,609
Receivables from related companies	876		876		974
Note receivable, short term	8		8		42
Due from related parties, short term	2,331		2,331		2,625
Note receivable, long term	923		923		109
Due from related parties, long term	923		923		109
Liabilities to related companies	4,597		4,597		7,847
Due to related parties, short term	4,597		4,597		7,847
ISO commission reserve	385		385		675
Due to related parties, long term	385		385		$ 675
Commission Expense
Related Party Transactions
Expenses with related parties	4,300	$ 9,800	13,800	$ 30,600
Sale of Equipment and Services
Related Party Transactions
Revenue from related parties		$ 100	$ 200	$ 400
Sale of Equipment and Services \| Maximum
Related Party Transactions
Revenue from related parties	$ 100

Amount of payables due to ISO commission, due after one year or the normal operating cycle, if longer.

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Amount of payables due to related companies by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of receivables due from related companies by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer.

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle).

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle).

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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