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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
Statement [LineItems] |
Summary of Weighted Average Assumptions of RPSU Plan Units Under Equity Method | The fair value and weighted average assumptions of the RSU plan units granted during the nine-month periods were as follows:
|  | Nine months ended September 30 |
|  | 2020 |  |  | 2019 |
Average fair value of units granted (per unit) |  | $ | 0.55 |  |  | $ | 2.77 |
Expected life of units (years) |  |  | 3.0 |  |  |  | 3.0 |
Expected forfeiture rate |  |  | 0.6 | % |  |  | 1.0 | %
Summary of Stock Option Activity and Related Information |
|  | Nine months ended September 30, 2020 |  |  | Year ended December 31, 2019 |
Options |  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Number of Options |  |  | Weighted Average Exercise Price |
Outstanding, beginning of period |  |  | 89,178 |  |  | $ | 10.41 |  |  |  | 287,996 |  |  | $ | 25.34 |
Granted |  |  | 917,490 |  |  |  | 0.56 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (44,714 | ) |  |  | 12.06 |  |  |  | (198,818 | ) |  |  | 32.04 |
Outstanding, end of period |  |  | 961,954 |  |  | $ | 0.94 |  |  |  | 89,178 |  |  | $ | 10.41 |
Exercisable, end of period |  |  | 44,464 |  |  | $ | 8.74 |  |  |  | 77,066 |  |  | $ | 10.67 |
Summary of Weighted Average Assumptions of Options Granted | The fair value and weighted average assumptions of the options granted during the nine-month periods were as follows:
|  | Nine months ended September 30 |
|  | 2020 |  |  | 2019 |
Average fair value of options granted (per option) |  | $ | 0.29 |  |  | $ | — |
Expected life of options (years) |  |  | 2.2 |  |  |  | — |
Expected forfeiture rate |  |  | 1.0 | % |  |  | — |
Summary of Share-Based Compensation | Share-based compensation consisted of the following:
|  | Nine months ended September 30 |
|  | 2020 |  |  | 2019 |
RSU grants |  | $ | 2 |  |  | $ | 3 |
Share-based compensation |  | $ | 2 |  |  | $ | 3 |
Restricted share unit plan [member] |
Statement [LineItems] |
Summary of Restricted and Performance Share Unit plan ("RPSU plan") |
RSU plan (number of shares equivalent) |  | Nine months ended September 30, 2020 |  |  | Year ended December 31, 2019 |
Outstanding, beginning of period |  |  | 1,100,278 |  |  |  | 1,235,202 |
Granted |  |  | 1,818,840 |  |  |  | 971,916 |
Vested |  |  | (507,565 | ) |  |  | (574,706 | )
Forfeited |  |  | (36,244 | ) |  |  | (532,134 | )
Outstanding, end of period |  |  | 2,375,309 |  |  |  | 1,100,278 |
PSU Plan [member] | Options granted from June 2017 [member] |
Statement [LineItems] |
Summary of Restricted and Performance Share Unit plan ("RPSU plan") |
PSU awards (number of shares equivalent) |  | Nine months ended September 30, 2020 |  |  | Year ended December 31, 2019 |
Outstanding, beginning of period |  |  | 92,424 |  |  |  | 163,129 |
Granted |  |  | 376,310 |  |  |  | 144,211 |
Vested |  |  | — |  |  |  | (22,929 | )
Forfeited |  |  | (4,173 | ) |  |  | (191,987 | )
Outstanding, end of period |  |  | 464,561 |  |  |  | 92,424 |

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