Intangible Assets and Goodwill - Summary of Change in Carrying Amount of Goodwill (Details) $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
USD ($)
| |
| Goodwill [Line Items] | |
| Goodwill, beginning balance | $ 163,154 |
| Goodwill, ending balance | 185,138 |
| Runbook Company B.V. | |
| Goodwill [Line Items] | |
| Acquisition | $ 21,984 |