Segment and Geographical Information - Long-lived Assets (Details) - Geographic Concentration Risk - Net Assets, Geographic Area - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Long-lived assets | $ 61,612 | $ 50,360 |
| Long-lived assets (as a percent) | 100.00% | 100.00% |
| Canada | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Long-lived assets | $ 58,460 | $ 40,309 |
| Long-lived assets (as a percent) | 94.90% | 80.00% |
| United States | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Long-lived assets | $ 1,593 | $ 9,633 |
| Long-lived assets (as a percent) | 2.60% | 19.20% |
| Rest of World | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Long-lived assets | $ 1,559 | $ 418 |
| Long-lived assets (as a percent) | 2.50% | 0.80% |