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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Domestic and Foreign Components of Income (Loss) Before Income Taxes | The following are the domestic and foreign components of the Company’s income (loss) before income taxes (in thousands):
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Domestic |  | $ | 29,224 |  |  | $ | 45,904 |  |  | $ | 66,148 |
International |  |  | 631 |  |  |  | (2,070 | ) |  |  | (2,523 | )
Income before income taxes |  | $ | 29,855 |  |  | $ | 43,834 |  |  | $ | 63,625 |
Components of Provision for (Benefit from) Income Taxes | The following are the components of the provision for (benefit from) income taxes (in thousands):
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 11,123 |  |  | $ | 18,300 |  |  | $ | 9,944 |
State and local |  |  | 2,325 |  |  |  | 5,595 |  |  |  | 3,906 |
Foreign |  |  | 140 |  |  |  | 64 |  |  |  | 558 |
Total current provision |  |  | 13,588 |  |  |  | 23,959 |  |  |  | 14,408 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 197 |  |  |  | (68 | ) |  |  | (172 | )
State and local |  |  | 141 |  |  |  | (539 | ) |  |  | (1,382 | )
Foreign |  |  | — |  |  |  | — |  |  |  | (27 | )
Total deferred (benefit) provision |  |  | 338 |  |  |  | (607 | ) |  |  | (1,581 | )
Total provision for income taxes |  | $ | 13,926 |  |  | $ | 23,352 |  |  | $ | 12,827 |
Reconciliation of Statutory Tax Rate to Effective Tax Rate | A reconciliation of the statutory tax rate to the effective tax rate for the periods presented is as follows:
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
U.S. federal statutory income tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State and local income taxes, net of federal benefit |  |  | 5.4 |  |  |  | 7.5 |  |  |  | 2.6 |
Foreign income at other than U.S. rates |  |  | (0.3 | ) |  |  | 1.1 |  |  |  | 2.7 |
Stock-based compensation |  |  | 0.4 |  |  |  | 3.8 |  |  |  | (19.0 | )
Meals and entertainment |  |  | 0.2 |  |  |  | 0.3 |  |  |  | 0.4 |
Change in value of preferred stock warrant liabilities |  |  | 7.0 |  |  |  | 7.6 |  |  |  | — |
Research and development credit |  |  | (1.0 | ) |  |  | (3.1 | ) |  |  | (2.8 | )
Federal deferred tax asset revaluation |  |  | — |  |  |  | — |  |  |  | 0.9 |
Other permanent items |  |  | (0.1 | ) |  |  | 0.4 |  |  |  | 0.9 |
Change in valuation allowance |  |  | — |  |  |  | 0.7 |  |  |  | (0.5 | )
Effective income tax rate |  |  | 46.6 | % |  |  | 53.3 | % |  |  | 20.2 | %
Tax Effects of Temporary Differences that Give Rise to a Significant Portion of Deferred Tax Assets and Deferred Tax Liabilities | Set forth below are the tax effects of temporary differences that give rise to a significant portion of the deferred tax assets and deferred tax liabilities (in thousands):
|  | As of December 31, |
|  | 2016 |  |  | 2017 |
Deferred tax assets (liabilities): |  |  |  |  |  |  |  |
Reserves and allowances |  | $ | 1,774 |  |  | $ | 1,804 |
Accrued expenses |  |  | 2,651 |  |  |  | 1,810 |
Net operating losses |  |  | 326 |  |  |  | — |
Research and development tax credit |  |  | 280 |  |  |  | 774 |
Stock-based compensation |  |  | 126 |  |  |  | 1,722 |
Other |  |  | 760 |  |  |  | 971 |
Prepaid expenses |  |  | (484 | ) |  |  | (580 | )
Property and equipment |  |  | (2,254 | ) |  |  | (2,026 | )
Capitalized software development costs |  |  | (1,075 | ) |  |  | (1,116 | )
Valuation allowance |  |  | (326 | ) |  |  | — |
Total deferred tax assets, net |  | $ | 1,778 |  |  | $ | 3,359 |
Reconciliation of Beginning and Ending Amounts of Gross Unrecognized Tax Benefits | A reconciliation of the beginning and ending amounts of gross unrecognized tax benefits is as follows (in thousands):
Balance at December 31, 2015 |  | $ | — |
Increases related to current year tax positions |  |  | 605 |
Increases related to prior year tax positions |  |  | 402 |
Balance at December 31, 2016 |  |  | 1,007 |
Increases related to current year tax positions |  |  | 1,971 |
Increases related to prior year tax positions |  |  | 123 |
Balance at December 31, 2017 |  | $ | 3,101 |

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