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Segment and Geographical Information - Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 253,354	$ 202,552	$ 164,445
Freelancers
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	163,242	132,066	113,371
Freelancers | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	40,313	26,596	21,455
Freelancers | India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	25,485	21,880	20,003
Freelancers | Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	17,057	14,761	13,394
Freelancers | Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	80,387	68,829	58,519
Clients
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	90,112	70,486	51,074
Clients | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	65,578	55,179	42,455
Clients | Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 24,534	$ 15,307	$ 8,619

X

- Definition

Amount, excluding 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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+ References

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