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Subsequent Events (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2021 USD ($) $ / shares shares | Nov. 11, 2021 shares | Nov. 10, 2021 $ / shares shares | Dec. 16, 2021 USD ($) bonus | Nov. 30, 2021 USD ($) | Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2019 $ / shares shares | Dec. 31, 2020 $ / shares shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes | $ |  |  |  |  |  |  | $ 1,560 | $ 630 |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.11 |  | $ 2.75 | $ 0.11
Period which warrants are exercisable |  |  |  |  |  |  |  |  | 4 years |
Warrants outstanding (in shares) |  |  |  |  |  |  | 422,549 |  | 15,277 | 422,549
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 7.50 |  |  |  |  |  |  |  |  |
Period which warrants are exercisable | 5 years |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 192,500 |  |  |  |  |  |  |  |  |
Warrant lock-up period | 180 days |  |  |  |  |  |  |  |  |
Proceeds from Initial Public Offering | $ | $ 14,939 |  |  |  | $ 14,939 |  |  |  |  |
Subsequent Event | Management |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Bonus frequency | bonus |  |  |  | 1 |  |  |  |  |  |
Subsequent Event | Management | Chief Executive Officer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Bonus | $ |  |  |  | $ 350 |  |  |  |  |  |
Subsequent Event | Management | Chief Financial Officer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Bonus | $ |  |  |  | $ 40 |  |  |  |  |  |
Subsequent Event | Convertible debt | 2015 Notes |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes | $ |  |  |  |  |  | $ 155 |  |  |  |
Number of units issued in debt conversion (in shares) |  |  | 1,497,216 |  |  |  |  |  |  |
Subsequent Event | IPO |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued in IPO (in shares) |  |  | 2,750,000 |  |  |  |  |  |  |
Subsequent Event | IPO | Common Stock |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued in IPO, price per share (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |
Shares issued per each unit (in shares) |  |  | 1 |  |  |  |  |  |  |
Subsequent Event | IPO | Warrants |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued in IPO, price per share (in dollars per share) | $ / shares |  |  | $ 6.00 |  |  |  |  |  |  |
Shares issued per each unit (in shares) |  |  | 1 |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  | $ 6.00 |  |  |  |  |  |  |
Period which warrants are exercisable |  |  | 5 years |  |  |  |  |  |  |
Subsequent Event | Over-Allotment Option |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued in IPO (in shares) |  | 412,500 | 412,500 |  |  |  |  |  |  |
Optional period to purchase additional shares |  |  | 30 days |  |  |  |  |  |  |

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