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v3.22.4

Commitments and contingencies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Commitments and contingencies |
Schedule of rent expense | The Company utilizes leased facilities and operates equipment under non-cancelable operating leases through July 2030. Below is a table of key properties: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Lease
​ | ​ | Annual | ​ | Expiration
Location | ​ | Rent | ​ | Date
Baton Rouge, Louisiana | ​ | $ | 30,000 |  | 5/2024
Champaign, Illinois | ​ | $ | 609,000 |  | 12/2024
Champaign, Illinois (2nd location) | ​ | $ | 349,000 | ​ | 9/2026
Charlotte, North Carolina | ​ | $ | 34,000 |  | 5/2025
Escondido, California | ​ | $ | 230,000 |  | 6/2027
Hampstead, New Hampshire | ​ | $ | 33,000 |  | 8/2023
Long Beach, California | ​ | $ | 28,800 |  | 2/2024
Ontario, California | ​ | $ | 168,000 |  | 12/2024
Riverside, California | ​ | $ | 27,000 |  | Month to Month
Rantoul, Illinois | ​ | $ | 36,000 | ​ | Month to Month
Smyrna, Georgia | ​ | $ | 483,000 |  | 7/2030
Stony Point, New York | ​ | $ | 110,000 |  | 6/2023
Woodcliff Lake, New Jersey | ​ | $ | 158,000 | ​ | 8/2027
​

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