Financial Risk Management and Financial Instruments - Summary of Key Assumptions Used to Estimate Fair Value of Ordinary Shares and Contingent Options Using PWERM (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Disclosure Of Financial Risk Management And Financial Instruments [Line Items] | |||
| Revenue multiple used to estimate enterprise value | 3.0 | ||
| Discount rate (%) | 13.00% | ||
| Bottom Of Range [Member] | |||
| Disclosure Of Financial Risk Management And Financial Instruments [Line Items] | |||
| Revenue multiple used to estimate enterprise value | 2.2 | 2.0 | |
| Discount rate (%) | 13.00% | 14.00% | |
| Volatility (%) | 32.50% | 30.00% | 35.00% |
| Top of range | |||
| Disclosure Of Financial Risk Management And Financial Instruments [Line Items] | |||
| Revenue multiple used to estimate enterprise value | 4.6 | 3.5 | |
| Discount rate (%) | 19.50% | 19.50% | |
| Volatility (%) | 35.00% | 37.50% | 47.50% |