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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Accounting Policies [Abstract] |
Advertising Costs | Advertising costs for the three and six months ended June 30, 2019 and 2018, are reflected in the following table (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Advertising costs | $ | 14,992 |  |  | $ | 14,416 |  |  | $ | 27,829 |  |  | $ | 27,497 |
Internal-Use Software Development Costs Capitalized | Internal-use software development costs capitalized for the three and six months ended June 30, 2019 and 2018, are reflected in the following table (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Internal-use software development costs | $ | 7,864 |  |  | $ | 1,812 |  |  | $ | 12,900 |  |  | $ | 2,267 |

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