Reverse capitalization - Retroactive Application of Reverse Capitalization to Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders’ Deficit (Details) - USD ($)
$ in Thousands |
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1 Months Ended |
12 Months Ended |
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Jan. 07, 2021 |
Jan. 31, 2021 |
Dec. 31, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Schedule Of Reverse Capitalization [Line Items] |
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| Convertible preferred shares outstanding (in shares) |
|
|
139,444,346
|
0
|
|
|
|
|
| Common stock, shares, outstanding (in shares) |
|
|
89,206,266
|
|
|
|
88,279,119
|
87,362,592
|
| Common stock - amount |
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|
|
|
|
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|
$ 9
|
| 1/7/21 conversion ratio |
206.81%
|
206.81%
|
206.81%
|
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| Convertible Preferred stock |
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|
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| Schedule Of Reverse Capitalization [Line Items] |
|
|
|
|
|
|
|
|
| Convertible preferred shares outstanding (in shares) |
|
|
139,444,346
|
0
|
139,444,346
|
139,444,346
|
139,444,346
|
139,444,346
|
| Previously Reported |
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|
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| Schedule Of Reverse Capitalization [Line Items] |
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| Common stock, shares, outstanding (in shares) |
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|
43,134,938
|
|
|
|
42,686,624
|
42,243,445
|
| Common stock - amount |
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|
|
|
|
|
|
$ 4
|
| Previously Reported | Convertible Preferred stock |
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| Schedule Of Reverse Capitalization [Line Items] |
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| Convertible preferred shares outstanding (in shares) |
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|
67,427,138
|
|
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|
67,427,138
|
67,427,138
|