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Commitments and contingencies - Non-cancelable operating leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commitments and contingencies
Annual Rent	$ 1,900,000	$ 1,700,000	$ 2,600,000
Baton Rouge Louisiana
Commitments and contingencies
Annual Rent	$ 31,000
Lease Expiration Date	Jul. 01, 2026
Champaign, Illinois
Commitments and contingencies
Annual Rent	$ 661,000
Lease Expiration Date	Dec. 01, 2027
Champaign, Illinois (2nd location)
Commitments and contingencies
Annual Rent	$ 349,000
Lease Expiration Date	Sep. 01, 2026
Charlotte, North Carolina
Commitments and contingencies
Annual Rent	$ 37,000
Lease Expiration Date	May 01, 2025
Escondido, California
Commitments and contingencies
Annual Rent	$ 249,000
Lease Expiration Date	Jun. 01, 2027
Long Beach, California
Commitments and contingencies
Annual Rent	$ 28,800
Lease Expiration Date	Feb. 01, 2025
Ontario, California
Commitments and contingencies
Annual Rent	$ 180,000
Lease Expiration Date	Dec. 01, 2027
Riverside, California
Commitments and contingencies
Annual Rent	$ 27,000
Lease expiration period description	Month to Month
Rantoul, Illinois
Commitments and contingencies
Annual Rent	$ 36,000
Lease expiration period description	Month to Month
Smyrna, Georgia
Commitments and contingencies
Annual Rent	$ 501,400
Lease Expiration Date	Jul. 01, 2030
Stony Point, New York
Commitments and contingencies
Annual Rent	$ 122,000
Lease Expiration Date	Jun. 01, 2026
Woodcliff Lake, New Jersey
Commitments and contingencies
Annual Rent	$ 315,000
Lease Expiration Date	Aug. 01, 2027

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