Goodwill - Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Goodwill [Roll Forward] | ||
| Goodwill balance, beginning of year | $ 15,504 | $ 2,373 |
| Goodwill balance, end of year | 20,317 | 15,504 |
| Oberlo UAB | ||
| Goodwill [Roll Forward] | ||
| Increase related to acquisitions | 4,813 | 0 |
| Kit CRM Inc. | ||
| Goodwill [Roll Forward] | ||
| Increase related to acquisitions | 0 | 6,929 |
| Boltmade Inc. | ||
| Goodwill [Roll Forward] | ||
| Increase related to acquisitions | 0 | 5,450 |
| Other Acquisitions | ||
| Goodwill [Roll Forward] | ||
| Increase related to acquisitions | $ 0 | $ 752 |