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Leases | 3 Months Ended
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Mar. 31, 2022
Leases |
Lessee, Operating Leases [Text Block] | 6. Leases Company Headquarters (Waltham, MA) ​ In April 2021, the Company entered a sublease agreement for office and storage space for its corporate headquarters located at 500 Totten Pond Road in Waltham, MA. The sublease has an initial term of 42 months beginning on May 1, 2021, and expiring on October 31, 2024. The Company is required to maintain a minimum cash balance of $0.7 million as a security deposit on the space which is classified as restricted cash, current and restricted cash, non-current on the condensed consolidated balance sheets. The Company pays for its proportionate share of building operating expenses and taxes that are treated as variable costs and excluded from the measurement of the lease. The sublease grants the Company an option to extend the term for an additional three years at the then fair market rent by giving the landlord nine months’ written notice. The Company was not reasonably certain to exercise the option to extend the lease and therefore the extension term was excluded from the measurement of the lease. Storage Facilities The Company additionally leases three storage spaces on a month-to-month basis that are classified as short-term leases. The following tables contains a summary of the lease costs recognized under ASC 842 and other information pertaining to the Company’s operating leases for the three months ended March 31, 2022. ​ The components of lease cost under ASC 842 were as follows (in thousands): ​
​ | ​ | ​ | ​
Operating lease cost |  | $ | 245
​ Supplemental disclosure of cash flow information related to leases was as follows (in thousands): ​
​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of lease liabilities |  | $ | 278
​ The weighted-average remaining lease term and discount rate were as follows: ​
​ | ​ | ​ | ​ | ​
Weighted average remaining lease term (in years) |  | ​ | 2.6 | ​
Weighted average discount rate |  | ​ | 6.95 | %
​ Future annual lease payments under non-cancelable operating leases as of March 31, 2022 were as follows (in thousands): ​
​ | ​ | ​ | ​
Year Ended December 31: |  | ​ | ​
2022 (remaining nine months) |  | $ | 838
2023 | ​ | ​ | 1,149
2024 | ​ | ​ | 982
Total future lease payments | ​ | $ | 2,969
Less: imputed interest | ​ | ​ | (246)
Present value of operating lease liability | ​ | $ | 2,723
​ Rent expense for the three months ended March 31, 2021 was approximately $0.1 million in accordance with ASC 840. Rent expense for the year ended December 31, 2021 was approximately $0.9 million in accordance with ASC 840. ​ Future annual lease payments under non-cancelable operating leases as of December 31, 2021 under ASC 840 were as follows (in thousands): ​
​ | ​ | ​ | ​
Year Ended December 31: |  | ​ | ​
2022 |  | $ | 1,116
2023 | ​ | ​ | 1,150
2024 | ​ | ​ | 981
Total | ​ | $ | 3,247
​

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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