Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Amortization expense | ||||
| Amortization of intangible assets | $ 1,439 | $ 1,321 | $ 2,885 | $ 2,551 |
| Cost of revenue | ||||
| Amortization expense | ||||
| Amortization of intangible assets | 924 | 791 | 1,845 | 1,565 |
| Research and development | ||||
| Amortization expense | ||||
| Amortization of intangible assets | 18 | 47 | 46 | 95 |
| Sales and marketing | ||||
| Amortization expense | ||||
| Amortization of intangible assets | $ 497 | $ 483 | $ 994 | $ 891 |