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Summary of Significant Accounting Policies - Summary of Changes on Consolidated Statement of Cash Flows as a Result of Adoption of ASC 606 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |
Net income | $ 42,146 | $ 65,170 | $ 13,199
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 7,817 | 5,029 | 3,795
Currency (gain) loss on foreign denominated transactions | (690) | (190) | 128
Deferred taxes | (3,734) | (39,040) | (1,117)
Provision for doubtful accounts | 1,091 | 1,680 | 1,117
Stock–based compensation expense | 34,301 | 20,794 | 5,028
Amortization of deferred contract costs | 8,416 | 3,689 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (9,608) | (1,911) | (7,039)
Prepaid expenses, prepaid income taxes, and other assets | (378) | (11,753) | (2,287)
Deferred contracts costs | (15,979) | (12,987) |
Accounts payable | 4,268 | 9,345 | 6,244
Accrued expenses, accrued income taxes and other current liabilities | 2,151 | 2,695 | 5,191
Deferred revenue | 1,174 | 4,508 | 962
Deferred rent |  | 4,289 | 227
Other non–current liabilities | 609 | 405 | 243
Net cash provided by operating activities | $ 70,116 | 51,723 | $ 25,691
Adjustments | ASC 606 | Costs To Obtain a Contract |  |  |
Operating Activities |  |  |
Net income |  | 6,899 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred taxes |  | 2,399 |
Amortization of deferred contract costs |  | 3,689 |
Changes in operating assets and liabilities: |  |  |
Deferred contracts costs |  | (12,987) |
Adjustments | ASC 606 | Marketplace Subscription Revenue |  |  |
Operating Activities |  |  |
Net income |  | 89 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred taxes |  | 37 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net |  | (126) |
Pro Forma as if the Previous Accounting Guidance was in Effect | ASC 606 |  |  |
Operating Activities |  |  |
Net income |  | 58,182 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization |  | 5,029 |
Currency (gain) loss on foreign denominated transactions |  | (190) |
Deferred taxes |  | (41,476) |
Provision for doubtful accounts |  | 1,680 |
Stock–based compensation expense |  | 20,794 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net |  | (1,785) |
Prepaid expenses, prepaid income taxes, and other assets |  | (11,753) |
Accounts payable |  | 9,345 |
Accrued expenses, accrued income taxes and other current liabilities |  | 2,695 |
Deferred revenue |  | 4,508 |
Deferred rent |  | 4,289 |
Other non–current liabilities |  | 405 |
Net cash provided by operating activities |  | $ 51,723 |

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