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Property, Plant and Equipment, Net | 9 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | 4. Property, Plant and Equipment, Net Property, plant and equipment, net consisted of the following (in thousands):
|  | September 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Transplant aircraft |  | $ | 281,018 |  |  | $ | 252,090 |
Transplant aircraft equipment |  |  | 3,100 |  |  |  | — |
Flight school aircraft |  |  | 3,717 |  |  |  | 3,717 |
OCS Consoles |  |  | 22,866 |  |  |  | 19,193 |
Manufacturing equipment |  |  | 11,218 |  |  |  | 10,496 |
Computer equipment and software |  |  | 4,144 |  |  |  | 3,979 |
Internal-use software |  |  | 9,049 |  |  |  | — |
Laboratory equipment |  |  | 3,317 |  |  |  | 2,904 |
Office, trade show and training equipment |  |  | 5,292 |  |  |  | 4,698 |
Leasehold improvements |  |  | 23,531 |  |  |  | 22,949 |
Construction-in-progress |  |  | 3,755 |  |  |  | 6,658 |
Land |  |  | 2,593 |  |  |  | — |
|  |  | 373,600 |  |  |  | 326,684 |
Less: Accumulated depreciation and amortization |  |  | (60,578 | ) |  |  | (40,714 | )
|  | $ | 313,022 |  |  | $ | 285,970 |
The expected useful life of transplant aircraft equipment is 10 years and the expected useful life of internal-use software is five years. In July 2025, the Company purchased two parcels of land in Mirandola, Italy for a total purchase price of $2.6 million. Substantially all of the Company's other tangible property, plant and equipment are held in the United States. During the three and nine months ended September 30, 2025, total depreciation and amortization expense was $6.8 million and $19.6 million, respectively. During the three and nine months ended September 30, 2024, total depreciation and amortization expense was $5.1 million and $13.9 million, respectively. The Company capitalized costs associated with the development of internal-use software of $2.2 million and $6.2 million in the three and nine months ended September 30, 2025, respectively, and $1.1 million and $1.6 million in the three and nine months ended September 30, 2024, respectively. The Company recorded amortization expense of $0.4 million and $0.8 million during the three and nine months ended September 30, 2025, respectively, related to internal-use software placed into service in 2025. The net book value of internal-use software was $9.8 million and $4.4 million as of September 30, 2025 and December 31, 2024, respectively, of which $1.6 million and $4.4 million was included in construction-in-progress as of those respective dates.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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