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Commitments and contingencies - Non-cancelable operating leases (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Commitments and contingencies |  |
Annual Rent | $ 2,600,000 | $ 3,100,000
Baton Rouge Louisiana |  |
Commitments and contingencies |  |
Lease Expiration Date | May 01, 2024 |
Annual Rent | $ 30,000 |
Champaign, Illinois |  |
Commitments and contingencies |  |
Lease Expiration Date | Dec. 01, 2024 |
Annual Rent | $ 609,000 |
Champaign, Illinois (2nd location) |  |
Commitments and contingencies |  |
Lease Expiration Date | Sep. 01, 2026 |
Annual Rent | $ 349,000 |
Charlotte, North Carolina |  |
Commitments and contingencies |  |
Lease Expiration Date | May 01, 2025 |
Annual Rent | $ 34,000 |
Escondido,California |  |
Commitments and contingencies |  |
Lease Expiration Date | Jun. 01, 2027 |
Annual Rent | $ 230,000 |
Hampstead, New Hampshire |  |
Commitments and contingencies |  |
Lease Expiration Date | Aug. 01, 2023 |
Annual Rent | $ 33,000 |
Long Beach California |  |
Commitments and contingencies |  |
Lease Expiration Date | Feb. 01, 2024 |
Annual Rent | $ 28,800 |
Ontario, California |  |
Commitments and contingencies |  |
Lease Expiration Date | Dec. 01, 2024 |
Annual Rent | $ 168,000 |
Riverside, California |  |
Commitments and contingencies |  |
Lease expiration period description | Month to Month |
Annual Rent | $ 27,000 |
Rantoul, Illinois |  |
Commitments and contingencies |  |
Lease expiration period description | Month to Month |
Annual Rent | $ 36,000 |
Smyrna, Georgia |  |
Commitments and contingencies |  |
Lease Expiration Date | Jul. 01, 2030 |
Annual Rent | $ 483,000 |
Stony Point, New York |  |
Commitments and contingencies |  |
Lease Expiration Date | Jun. 01, 2023 |
Annual Rent | $ 110,000 |
Woodcliff Lake, New Jersey |  |
Commitments and contingencies |  |
Lease Expiration Date | Aug. 01, 2027 |
Annual Rent | $ 158,000 |

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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