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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Components of Loss Before Income Taxes | Loss before income taxes included in the consolidated statements of operations was as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands)
United States | $ | (72,846) |  |  | $ | (41,111) |  |  | $ | (39,754) |
Foreign | (24,017) |  |  | (12,692) |  |  | (15,325) |
Loss before income taxes | $ | (96,863) |  |  | $ | (53,803) |  |  | $ | (55,079) |
Summary of Income Tax (Benefit) Expense | Income tax expense included in the consolidated statements of operations was as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands)
Current: |  |  |  |  |
Federal | $ | 8 |  |  | $ | 260 |  |  | $ | 124 |
State and local | 122 |  |  | 109 |  |  | 126 |
Foreign | 1,149 |  |  | 255 |  |  | 228 |
Total current tax expense | 1,279 |  |  | 624 |  |  | 478 |
Deferred: |  |  |  |  |
Federal | 9 |  |  | 9 |  |  | (285) |
State and local | 2 |  |  | 2 |  |  | 16 |
Foreign | 696 |  |  | (593) |  |  | 257 |
Total deferred tax expense (benefit) | 707 |  |  | (582) |  |  | (12) |
Income tax expense | $ | 1,986 |  |  | $ | 42 |  |  | $ | 466 |
Reconciliation of Income Taxes Computed at Federal Statutory Rate and Provision for Income Taxes | The reconciliation of the federal statutory rate of 21% to the effective income tax rate for the years ended December 31, 2020, 2019 and 2018 was as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Federal statutory rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State taxes, net of federal benefit | (0.1) |  |  | (0.2) |  |  | (0.2) |
Permanent differences | (4.0) |  |  | (2.8) |  |  | 0.2 |
Stock-based compensation | 12.1 |  |  | 22.3 |  |  | 9.3 |
Federal research and development credit | 1.1 |  |  | 1.3 |  |  | 1.2 |
Foreign rate differential | (1.4) |  |  | (1.4) |  |  | (1.1) |
Change in valuation allowance | (30.0) |  |  | (41.0) |  |  | (32.8) |
Other | (0.8) |  |  | 0.7 |  |  | 1.5 |
Effective income tax rate | (2.1) | % |  | (0.1) | % |  | (0.9) | %
Components of Net Deferred Tax Assets and Liabilities | Net deferred tax assets and liabilities, as set forth in the table below, reflect the impact of temporary differences between the amounts of assets and liabilities recorded for financial statement purposes and such amounts measured in accordance with tax laws:
| As of December 31,
| 2020 |  | 2019
| (in thousands)
Deferred tax assets: |  |  |
Accruals and reserves | $ | 1,272 |  |  | $ | 323 |
Net operating loss carryforwards | 117,478 |  |  | 85,969 |
Deferred revenue | 7,951 |  |  | 14,401 |
Depreciation | 3,330 |  |  | 2,335 |
Research and development credits | 6,201 |  |  | 4,665 |
Operating lease liabilities | 20,967 |  |  | 19,657 |
Stock-based compensation | 4,755 |  |  | 3,806 |
Tax credits | 1,148 |  |  | 1,181 |
Other | 2,105 |  |  | 61 |
Gross deferred tax assets | 165,207 |  |  | 132,398 |
Valuation allowance | (110,350) |  |  | (94,581) |
Total deferred tax assets | 54,857 |  |  | 37,817 |
Deferred tax liabilities: |  |  |
Intangible assets | (5,717) |  |  | (2,249) |
Operating lease ROU assets | (16,233) |  |  | (14,792) |
Convertible senior notes | (17,961) |  |  | (9,959) |
Deferred contract acquisition and fulfillment costs | (15,908) |  |  | (11,565) |
Other | (543) |  |  | (20) |
Total deferred tax liabilities | (56,362) |  |  | (38,585) |
Net deferred tax liabilities | $ | (1,505) |  |  | $ | (768) |

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