Reverse capitalization - Retroactive Application of Reverse Capitalization to Consolidated Balance Sheets (Details) - $ / shares
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1 Months Ended |
3 Months Ended |
9 Months Ended |
12 Months Ended |
Jan. 07, 2021 |
Jan. 31, 2021 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Schedule Of Reverse Capitalization [Line Items] |
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| Net loss per share attributable to common shareholders - basic (in dollars per share) |
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$ (0.08)
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$ 0.06
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$ (0.98)
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$ (0.11)
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$ (1.54)
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$ (4.14)
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| Net loss per share attributable to common shareholders - diluted (in dollars per share) |
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$ (0.08)
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$ 0.02
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$ (0.98)
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$ (0.11)
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$ (1.54)
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$ (4.14)
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| Basic weighted average number of common shares and common shares equivalents outstanding (in shares) |
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414,572,706
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88,863,244
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410,417,493
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88,616,116
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88,691,582
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87,829,419
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| Diluted weighted average number of common shares and common shares equivalents outstanding (in shares) |
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414,572,706
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248,133,335
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410,417,493
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88,616,116
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88,691,582
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87,829,419
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| 1/7/21 conversion ratio |
206.81%
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206.81%
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206.81%
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| Previously Reported |
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| Schedule Of Reverse Capitalization [Line Items] |
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| Net loss per share attributable to common shareholders - basic (in dollars per share) |
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$ (3.18)
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$ (8.56)
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| Net loss per share attributable to common shareholders - diluted (in dollars per share) |
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$ (3.18)
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$ (8.56)
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| Basic weighted average number of common shares and common shares equivalents outstanding (in shares) |
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42,886,067
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42,469,175
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| Diluted weighted average number of common shares and common shares equivalents outstanding (in shares) |
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42,886,067
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42,469,175
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