Summary of significant accounting policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Revenue recognition
Number of revenue streams	2plpm_NumberOfRevenueStreams
Payment processing services revenue
Provision for sales credits	$ 0us-gaap_SalesAllowancesGoods	$ 0us-gaap_SalesAllowancesGoods	$ 0us-gaap_SalesAllowancesGoods
Translation of non-U.S. currencies
Amounts resulting from foreign currency transactions included in statement of operations	0.2	0.1
Allowance for doubtful accounts
Allowance for doubtful accounts	0.1	0.2
Trade receivable written-off		$ 1.4
Goodwill, intangibles and long-lived assets
Amortization period of acquired identifiable intangible assets	5 years

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- Definition

A revenue stream is a form of revenue. It refers specifically to the individual methods by which money comes into the entity.

+ References

No definition available.

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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- Definition

The aggregate selling price reductions recognized during an accounting period including, but not limited to, the sale of defective or nonconforming goods, a strategy to increase sales (generally over the short-term), move slow-moving items, develop distribution channels, or reward valuable customers. Allowances are a deduction from gross revenue in arriving at net revenue.

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