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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment, Net. |
Property, Plant and Equipment, Net | Note 5. Property, Plant and Equipment, Net The components of our property, plant and equipment are summarized below (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​
​ | ​ | 2024 | ​ | 2023 | ​
Property, plant and equipment: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Machinery and equipment, at cost | ​ | $ | 67,917 | ​ | $ | 65,918 | ​
Less: accumulated depreciation and amortization | ​ | ​ | (44,065) | ​ | ​ | (42,112) | ​
Building, at cost | ​ | ​ | 137,420 | ​ | ​ | 125,786 | ​
Less: accumulated depreciation and amortization | ​ | ​ | (26,310) | ​ | ​ | (23,339) | ​
Leasehold improvements, at cost | ​ |  | 7,575 | ​ |  | 7,596 | ​
Less: accumulated depreciation and amortization | ​ | ​ | (6,347) | ​ | ​ | (5,984) | ​
Construction in progress | ​ |  | 23,531 | ​ |  | 38,483 | ​
​ | ​ | $ | 159,721 | ​ | $ | 166,348 | ​
​ As of December 31, 2024, the balance of construction in progress was $23.5 million, of which $17.9 million was related to our buildings in our Dingxing and Kazuo locations, $1.4 million was for manufacturing equipment purchases not yet placed in service and $4.3 million was from our construction in progress for our other consolidated subsidiaries. As of December 31, 2023, the balance of construction in progress was $38.5 million, of which $31.2 million was related to our buildings in our Dingxing and Kazuo locations, $3.1 million was for manufacturing equipment purchases not yet placed in service and $4.2 million was from our construction in progress for our other consolidated subsidiaries. Depreciation and amortization expense was $9.0 million, $8.7 million and $8.1 million for the years ended December 31, 2024, 2023 and 2022, respectively.

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