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Segment and Geographical Information - Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- 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 -Subparagraph (a) -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 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 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 + Details
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