Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

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.

+ References

No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

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-Name Accounting Standards Codification
-Topic 805
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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
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Business Acquisitions - Additional Information (Details) - USD ($)				12 Months Ended
	Apr. 28, 2017	Oct. 03, 2016	Apr. 18, 2016	Dec. 31, 2017
Acquired technology
Business Acquisition [Line Items]
Acquired technology, amortization period (in years)				3 years
Customer relationships
Business Acquisition [Line Items]
Acquired technology, amortization period (in years)				2 years
Oberlo UAB
Business Acquisition [Line Items]
Percentage of company acquired	100.00%
Cash consideration	$ 17,239,000
Goodwill recognized expected to be deductible for income tax purposes				$ 0
Oberlo UAB \| Acquired technology
Business Acquisition [Line Items]
Estimated fair value of identifiable assets acquired	11,590,000
Oberlo UAB \| Customer relationships
Business Acquisition [Line Items]
Estimated fair value of identifiable assets acquired	$ 395,000
Boltmade Inc.
Business Acquisition [Line Items]
Percentage of company acquired		100.00%
Cash consideration		$ 6,015,000
Goodwill recognized expected to be deductible for income tax purposes				0
Kit CRM Inc.
Business Acquisition [Line Items]
Percentage of company acquired			100.00%
Cash consideration			$ 8,254,000
Goodwill recognized expected to be deductible for income tax purposes				$ 0
Kit CRM Inc. \| Acquired technology
Business Acquisition [Line Items]
Estimated fair value of identifiable assets acquired			$ 1,071,000
Acquired technology, amortization period (in years)				2 years