Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Amortization expense | ||
| Amortization of intangible assets | $ 1,446 | $ 1,230 |
| Cost of revenue | ||
| Amortization expense | ||
| Amortization of intangible assets | 921 | 774 |
| Research and development | ||
| Amortization expense | ||
| Amortization of intangible assets | 28 | 48 |
| Sales and marketing | ||
| Amortization expense | ||
| Amortization of intangible assets | $ 497 | $ 408 |