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Property, Plant and Equipment, Net
 6 Months Ended
Jun. 30, 2022
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,
2022		December 31,
2021
Land and land improvements$164 $164 
Buildings and building improvements2,592 2,592 
Furniture and fixtures449 434 
Equipment17,570 16,812 
Leasehold improvements3,495 3,366 
Breeding stock49 36 
Computer hardware and software4,537 4,823 
Construction and other assets in progress1,059 1,829 
29,915 30,056 
Less: Accumulated depreciation and amortization(22,189)(21,457)
Property, plant and equipment, net$7,726 $8,599 
Depreciation expense was $616 and $734 for the three months ended June 30, 2022 and 2021, respectively, and $1,269 and $1,469 for the six months ended June 30, 2022 and 2021, respectively.