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Common stock and convertible preferred stock - Common Stock (Details) |  |  |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 28, 2021 USD ($) $ / shares item shares | Oct. 13, 2020 USD ($) $ / shares | Oct. 13, 2020 $ / shares shares | Oct. 06, 2020 $ / shares shares | Jun. 30, 2021 USD ($) Vote $ / shares shares | Apr. 26, 2021 $ / shares | Dec. 31, 2020 $ / shares shares | Jun. 30, 2020 $ / shares
Common stock voting right | Vote |  |  |  |  | 1 |  |  |
Proceeds from issuance of common stock | $ |  | $ 41,700,000 |  |  | $ 906,000 |  |  |
Payments of underwriting discounts and commissions | $ |  | $ 3,100,000 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.0001 |  | $ 0.0001 |
Common Stock, Shares Authorized | shares |  |  |  |  | 200,000,000 |  | 200,000,000 |
Fair value of common stock |  |  |  |  | $ 25.60 | $ 28.70 |  | $ 1.62
IPO And Over-Allotment Option |  |  |  |  |  |  |  |
Stock issued | shares |  |  |  | 3,737,500 |  |  |  |
IPO |  |  |  |  |  |  |  |
Stock issued | shares |  |  |  | 3,250,000 |  |  |  |
Share price |  |  |  | $ 12.00 |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  | $ 0.0001 |  |  |  |
Common Stock, Shares Authorized | shares |  |  |  | 200,000,000 |  |  |  |
Preferred Stock, Shares Authorized | shares |  |  |  | 10,000,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 0.0001 |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |
Stock issued | shares |  |  | 487,500 |  |  |  |  |
Share price |  | $ 12.00 | $ 12.00 |  |  |  |  |
Private offering |  |  |  |  |  |  |  |
Share price | $ 27.00 |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ | $ 27,000,000.0 |  |  |  |  |  |  |
Units Issued During Period, New Issues | shares | 1,000,000 |  |  |  |  |  |  |
Number of share for company's common stock | 1 |  |  |  |  |  |  |
Number of warrants | shares | 1 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 45.00 |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term | 3 years |  |  |  |  |  |  |
Fair Value of Warrants | $ | $ 6,000,000.0 |  |  |  |  |  |  |
Volatility rate |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | 82.7 |  |  |  |  |  |  |
Risk-free interest rate |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.35 |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | $ | 3 |  |  |  |  |  |  |
Strike price (per share) |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | 45.00 |  |  |  |  |  |  |

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