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Property, Plant and Equipment, Net
 6 Months Ended
Jun. 30, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment consist of the following:
June 30,
2024		December 31,
2023
Land and land improvements$164 $164 
Buildings and building improvements2,629 2,629 
Furniture and fixtures379 530 
Equipment16,628 18,576 
Leasehold improvements4,475 4,380 
Breeding stock83 79 
Computer hardware and software3,213 3,459 
Construction and other assets in progress8,109 1,577 
35,680 31,394 
Less: Accumulated depreciation and amortization(22,229)(24,283)
Property, plant and equipment, net$13,451 $7,111 
Depreciation expense was $388 and $475 for the three months ended June 30, 2024 and 2023, respectively, and $768 and $981 for the six months ended June 30, 2024 and 2023, respectively.
As discussed in Note 1, during the three and six months ended June 30, 2024, the Company suspended ActoBio's operations. As a result, the Company reviewed the related property, plant and equipment and right-of-use assets for impairment. Based on the estimated undiscounted cash flows, the Company determined that the related asset values were not fully recoverable and calculated estimated fair values using market participant assumptions. The estimated fair values were lower than the carrying values, and the Company recorded impairment losses of $110 related to property, plant, and equipment and $488 related to the right-of-use assets, which are included in impairment of other noncurrent assets in the accompanying condensed consolidated statements of operations.