Percentage of monthly salary contributed to insurance funds.

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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 charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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Maximum amount the employee may contribute to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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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.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Significant accounting policies (Narrative) (Details)	3 Months Ended		12 Months Ended
Significant accounting policies (Narrative) (Details)	Mar. 31, 2020 USD ($) segment shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Significant accounting policies
Carrying amount of the asset	$ 0	$ 0	$ 0	$ 0	$ 0
Defined contribution plan for employee in percentage	100.00%
Defined contribution plan for employee in amount	$ 18.5
Defined Contribution Plan Employer percentage match	50.00%
Defined Contribution Plan Employer percentage	6.00%
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true false]	true
Vesting period	4 years
Percentage of monthly salary contributed to insurance funds	8.33%
Severance costs	$ 634,000	505,000	2,359,000	1,638,000	1,194,000
Advertising costs	$ 12,537,000	$ 10,634,000	$ 41,341,000	$ 34,843,000	$ 24,813,000
Potentially dilutive options to purchase ordinary shares \| shares	4,737,555	4,164,475	4,578,542	2,974,891	2,444,806
Number of Reportable Segments \| segment	1
Number of Operating Segments \| segment	1
Deferred revenues resulting from transaction and service fees	$ 4,258,000		$ 3,248,000
Transaction Fee
Significant accounting policies
Revenue	25,256,000	$ 17,347,000	78,074,000	$ 55,117,000	$ 39,001,000
Service
Significant accounting policies
Revenue	$ 8,894,000	6,416,000	28,999,000	20,386,000	13,111,000
Internal-use software
Significant accounting policies
Intangible assets useful life	3 years
Intangible assets finite lived	$ 0	$ 0	$ 0	$ 0	$ 0
Minimum
Significant accounting policies
Intangible assets useful life	3 years
Maximum
Significant accounting policies
Intangible assets useful life	10 years