Goodwill and Intangible Assets (Amortization expense) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Amortization expense | ||||
| Amortization of intangible assets | $ 1,334 | $ 1,221 | $ 3,885 | $ 3,393 |
| Cost of revenue | ||||
| Amortization expense | ||||
| Amortization of intangible assets | 802 | 800 | 2,367 | 2,266 |
| Research and development | ||||
| Amortization expense | ||||
| Amortization of intangible assets | 50 | 50 | 145 | 140 |
| Sales and marketing | ||||
| Amortization expense | ||||
| Amortization of intangible assets | $ 482 | $ 371 | $ 1,373 | $ 987 |