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v3.21.2

Stockholders Equity (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 USD ($) $ / shares shares | Jun. 22, 2021 | Jul. 31, 2020 USD ($) $ / shares shares | Aug. 31, 2019 USD ($) | May 31, 2019 USD ($) | Jan. 31, 2019 USD ($) | Sep. 30, 2021 $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2020 $ / shares | May 31, 2016
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Temporary equity share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |
Conversion of convertible preferred stock (in shares) | 11,929,584 |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 39.548 |  |  |
Reverse stock split |  | 0.025 |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of common shares converted from warrants | 108,406 |  |  |  |  |  | 716,131 |  |  |
Warrant exercise price | $ / shares |  |  |  |  |  |  | $ 2.39 |  |  |
IPO |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued | 8,050,000 |  |  |  |  |  |  |  |  |
Share price | $ / shares | $ 18.00 |  |  |  |  |  |  |  |  |
Payment of stock issuance costs | $ | $ 1.6 |  |  |  |  |  |  |  |  |
Net proceeds | $ | $ 133.2 |  |  |  |  |  |  |  |  |
Underwriters option |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued | 1,050,000 |  |  |  |  |  |  |  |  |
Series G Preferred Shares |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 62,500,000 |  |  |  |  | 72,125,000 |  |
Temporary equity share price (in dollars per share) | $ / shares |  |  | $ 0.80 |  |  |  |  | $ 0.80 |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock | $ |  |  | $ 49.8 | $ 24.7 | $ 24.7 | $ 24.7 |  | $ 57.4 |  |
Conversion ratio |  |  |  |  |  |  | 15.819 |  |  | 1
Series G Preferred Shares | Operational milestone closing |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock | $ |  |  |  |  |  |  |  | $ 35.3 |  |

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