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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The geographical breakdown of income (loss) before income taxes is as follows (in thousands):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Domestic income (loss) | $ | 15,455 |  |  | $ | (20,345) |  |  | $ | (29,658) |
Foreign income | 3,684 |  |  | 3,933 |  |  | 3,123 |
Income (loss) before income taxes | $ | 19,139 |  |  | $ | (16,412) |  |  | $ | (26,535) |
Schedule of Components of Income Tax Expense (Benefit) | The provision for income taxes consisted of the following (in thousands):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Current provision for income taxes: |  |  |  |  |
State | $ | 40 |  |  | $ | 49 |  |  | $ | 44 |
Foreign | 1,057 |  |  | 1,716 |  |  | 953 |
Total current | 1,097 |  |  | 1,765 |  |  | 997 |
Deferred tax expense (benefit): |  |  |  |  |
Federal | 2 |  |  | 3 |  |  | (13) |
Foreign | 224 |  |  | (361) |  |  | 98 |
Total deferred | 226 |  |  | (358) |  |  | 85 |
Provision for income taxes | $ | 1,323 |  |  | $ | 1,407 |  |  | $ | 1,082 |
Schedule of Effective Income Tax Rate Reconciliation | The reconciliation of the statutory federal income taxes and the provision for income tax is as follows (in thousands, except percentages):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
| Amount |  | Percentage |  | Amount |  | Percentage |  | Amount |  | Percentage
Tax at statutory rate | $ | 4,019 |  |  | 21.0 | % |  | $ | (3,447) |  |  | 21.0 | % |  | $ | (5,572) |  |  | 21.0 | %
State tax - net of federal benefits | 31 |  |  | 0.2 |  |  | 42 |  |  | (0.3) |  |  | 39 |  |  | (0.1) |
Foreign rate differential | 507 |  |  | 2.6 |  |  | 363 |  |  | (2.2) |  |  | 258 |  |  | (1.0) |
Changes in federal valuation allowance | (3,281) |  |  | (17.1) |  |  | 4,695 |  |  | (28.6) |  |  | 6,430 |  |  | (24.2) |
Change in federal tax rate due to Tax Cuts and Jobs Act | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Stock-based compensation | 781 |  |  | 4.1 |  |  | 578 |  |  | (3.5) |  |  | 1,950 |  |  | (7.3) |
Non-deductible meals and entertainment expenses | 219 |  |  | 1.2 |  |  | 287 |  |  | (1.8) |  |  | 342 |  |  | (1.3) |
Other permanent items | 364 |  |  | 1.9 |  |  | 257 |  |  | (1.6) |  |  | 351 |  |  | (1.3) |
Federal tax credits - net of uncertain tax positions | (1,035) |  |  | (5.4) |  |  | (1,809) |  |  | 11.0 |  |  | (2,634) |  |  | 9.9 |
Expenses for uncertain tax positions | — |  |  | — |  |  | 166 |  |  | (1.0) |  |  | 137 |  |  | (0.5) |
Other | (282) |  |  | (1.5) |  |  | 275 |  |  | (1.6) |  |  | (219) |  |  | 0.7 |
| $ | 1,323 |  |  | 7.0 | % |  | $ | 1,407 |  |  | (8.6) | % |  | $ | 1,082 |  |  | (4.1) | %
Schedule of Deferred Tax Assets and Liabilities | Deferred tax balances are comprised of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ | 42,251 |  |  | $ | 46,273 |
Research and development credits, net of uncertain tax positions | 27,743 |  |  | 25,386 |
Accruals, reserves, and other | 12,026 |  |  | 12,021 |
Stock-based compensation | 2,362 |  |  | 3,306 |
Depreciation and amortization | 1,537 |  |  | 2,219 |
Operating lease liability | 6,049 |  |  | 7,061 |
Gross deferred tax assets | 91,968 |  |  | 96,266 |
Valuation allowance | (82,938) |  |  | (85,743) |
Total deferred tax assets | 9,030 |  |  | 10,523 |
Deferred tax liabilities: |  |  |
Deferred contract acquisition costs | (2,068) |  |  | (2,245) |
Operating lease right-of-use asset | (5,996) |  |  | (7,088) |
Other | (22) |  |  | (19) |
Total deferred tax liabilities | (8,086) |  |  | (9,352) |
Net deferred tax assets | $ | 944 |  |  | $ | 1,171 |
Summary of Income Tax Contingencies | The activity related to the unrecognized tax benefits is as follows (in thousands):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Gross unrecognized tax benefits—beginning balance | $ | 4,441 |  |  | $ | 4,191 |  |  | $ | 3,782 |
Increases (decreases) related to tax positions from prior years | (268) |  |  | (280) |  |  | (266) |
Increases related to tax positions taken during current year | 412 |  |  | 530 |  |  | 675 |
Decreases related to tax positions taken during the current year | — |  |  | — |  |  | — |
Gross unrecognized tax benefits—ending balance | $ | 4,585 |  |  | $ | 4,441 |  |  | $ | 4,191 |

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