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Property and Equipment | 9 Months Ended
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Sep. 30, 2021
Property and Equipment |
Property and Equipment | Note 5 - Property and Equipment At September 30, 2021 and December 31, 2020, Mustang’s property and equipment consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Estimated Useful |  | September 30, |  | December 31,
($ in thousands) | ​ | Life (in years) | ​ | 2021 | ​ | 2020
Computer equipment |  | 3 | ​ | $ | 144 | ​ | $ | 68
Furniture and fixtures |  | 5 | ​ |  | 370 | ​ |  | 181
Machinery and equipment |  | 5 | ​ |  | 6,330 | ​ |  | 5,748
Leasehold improvements |  | 9 | ​ |  | 7,653 | ​ |  | 5,099
Construction in process |  | N/A | ​ |  | 1,019 | ​ |  | 499
Total property and equipment | ​ | ​ | ​ |  | 15,516 | ​ |  | 11,595
Less: accumulated depreciation | ​ | ​ | ​ |  | (5,079) | ​ |  | (3,567)
Property and equipment, net | ​ | ​ | ​ | $ | 10,437 | ​ | $ | 8,028
​ Depreciation expense for the three months ended September 30, 2021, and 2020, was approximately $0.6 million and $0.4 million, respectively, and was recorded in research and development expense in the Unaudited Condensed Statements of Operations. Depreciation expense for the nine months ended September 30, 2021, and 2020, was approximately $1.5 million and $1.2 million, respectively, and was recorded in research and development expense in the Unaudited Condensed Statements of Operations.

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