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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |
Restricted cash | $ 2,700,000 | $ 2,300,000 |
Restricted cash, current | 2,200,000 | 1,800,000 |
Restricted cash, noncurrent | 500,000 | 500,000 |
Escrow funds payable | 98,186,000 | 87,195,000 |
Revenue | 253,354,000 | 202,552,000 | $ 164,445,000
Gross trade receivables | 9,100,000 | 8,600,000 |
Gross client receivables | $ 16,000,000 | 23,800,000 |
Capitalized costs, amortization period | 2 years |  |
Capitalized costs | $ 4,000,000 | 500,000 | 0
Internal-use software and platform development costs capitalized | 600,000 |  |
Internal-use software and platform development costs capitalized, amortization expense | $ 100,000 | 0 | 1,000,000
Number of reportable segments | segment | 1 |  |
Goodwill impairment | $ 0 |  |
Capitalized deferred offering costs |  | 100,000 |
Deferred offering costs |  | 6,300,000 |
Advertising expense | 23,600,000 | 14,600,000 | 10,800,000
Foreign currency transactions gain (loss) | $ (400,000) |  | (500,000)
Minimum |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Property and equipment, useful lives | 3 years |  |
Intangible asset, useful life | 2 years |  |
Maximum |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Property and equipment, useful lives | 5 years |  |
Intangible asset, useful life | 7 years |  |
Foreign Currency Forward Contracts |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Notional amount on derivatives | $ 4,800,000 | 3,600,000 |
Loss on derivatives | 400,000 |  | $ 500,000
Client Accounting For More than 10% revenue |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Revenue | $ 29,500,000 | $ 24,500,000 |

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