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Commitments and Contingencies | 9 Months Ended
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Sep. 30, 2021
Commitments and Contingencies [Abstract] |
Commitments and contingencies |
10. | Commitments and contingencies
Commitments Operating Leases The Company has entered into an operating lease agreement for its office, manufacturing and research facility, which expires in 2024. Rent expense for the three months ended September 30, 2021 and 2020 was $91,000 and $90,000, respectively. Rent expense for the nine months ended September 30, 2021 and 2020 was $279,000 and $276,000, respectively. Future minimum lease payments under all operating leases as of September 30, 2021, are as follows for the years ending (in thousands):
​ | ​ | ​ | ​
December 31, 2021 |  | $ | 56
December 31, 2022 | ​ |  | 227
December 31, 2023 | ​ |  | 234
December 31, 2024 | ​ |  | 138
​ | ​ | $ | 655
​ Contingencies From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of business. The Company accrues a liability for such matters when it is probable that future expenditures will be made, and such expenditures can be reasonably estimated. There have been no contingent liabilities requiring accrual or disclosure as of September 30, 2021 or December 31, 2020.

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