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Fair Value Measurement - Narrative (Detail) - $ / shares | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2019 | Apr. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2012 | Sep. 30, 2021
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  | $ 11.50
Series A Preferred Stock Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Warrants issued (in shares) |  | 122,400 |  |  |  |  |
Exercise price (in dollars per share) |  | $ 2.7233 |  |  |  |  |
Series A Preferred Stock Warrants | 2012 Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  | 1,000,000 |
Exercise price (in dollars per share) |  |  |  |  |  | $ 2.7233 |
Warrants exercise period |  |  |  |  |  | 10 years |
Warrants exercise period, extended | 10 years |  |  |  |  |  |
Series A Preferred Stock Warrants | 2015 Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  | 1,134,653 |  |
Exercise price (in dollars per share) |  |  |  |  | $ 2.7233 |  |
Warrants exercise period |  |  |  |  | 10 years |  |
Warrants exercise period, extended | 10 years |  |  |  |  |  |
Series B Preferred Stock Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Warrants issued (in shares) |  |  | 35,412 | 331,927 |  |  |
Exercise price (in dollars per share) |  |  | $ 7.486 | $ 7.486 |  |  |

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