Common stock and convertible preferred stock - Common Stock (Details) $ / shares in Units, $ in Thousands						12 Months Ended
	Oct. 13, 2021 USD ($)	Aug. 04, 2021 $ / shares shares	Apr. 28, 2021 USD ($) $ / shares Y item shares	Oct. 13, 2020 $ / shares shares	Oct. 06, 2020 $ / shares shares	Dec. 31, 2021 USD ($) Vote $ / shares shares	Oct. 14, 2021 USD ($)	Oct. 01, 2021 USD ($)	Dec. 31, 2020 $ / shares shares
Common stock voting right | Vote						1
Stock issued | shares		14,115
Share price		$ 15.94
Proceeds from issuance of common stock | $	$ 41,700					$ 1,338
Payments of underwriting discounts and commissions | $	$ 3,100
Common Stock, Par or Stated Value Per Share						$ 0.0001			$ 0.0001
Common Stock, Shares Authorized | shares						200,000,000			200,000,000
Preferred Stock, Shares Authorized | shares						10,000,000			10,000,000
Preferred stock par value (in dollars per share)						$ 0.0001			$ 0.0001
Fair value of common stock						$ 23.04			$ 5.30
Shelf Registration Statement | Maximum
Securities aggregate price | $							$ 200,000
Open Market Sale | Maximum
Securities aggregate price | $								$ 75,000
IPO And Over-Allotment Option
Stock issued | shares					3,737,500
IPO
Stock issued | shares					3,250,000
Share price					$ 12.00
Proceeds from issuance of common stock | $						$ 41,700
Payments of underwriting discounts and commissions | $						$ 3,100
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 value (in dollars per share)					$ 0.0001
Over-Allotment Option
Stock issued | shares				487,500
Share price				$ 12.00
Private offering
Stock issued | shares			1,000,000
Share price			$ 27.00
Proceeds from issuance of common stock | $			$ 27,000
Units Issued During Period, New Issues | shares			1,000,000
Number of share for company's common stock | item			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
Fair value of common stock			$ 28.70
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 | Y			3
Strike price (per share)
Warrants and Rights Outstanding, Measurement Input			45.00