Nature of the business and basis of presentation (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended		3 Months Ended
	Oct. 13, 2020	Oct. 13, 2020	Oct. 06, 2020	Apr. 30, 2021	Oct. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Net loss						$ (3,898)	$ (2,677)
Accumulated deficit						(58,292)		$ (54,394)
Proceeds from Issuance of Common Stock	$ 41,700					$ 105
Payments Of Underwriting Discounts And Commissions	$ 3,100
IPO
Stock Issued			3,250,000		3,757,500
Share price			$ 12.00		$ 12.00
Proceeds from Issuance of Common Stock					$ 41,700
Payments Of Underwriting Discounts And Commissions					$ 3,100
Over-Allotment Option
Stock Issued		487,500			487,500
Share price	$ 12.00	$ 12.00
Private offering
Proceeds from Issuance of Common Stock				$ 27,000