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Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 2022
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consisted of the following:
|  | June 30, |  | December 31,
(in thousands) |  | 2022 |  | 2021
Furniture and fixtures |  | $ | 173 |  |  | $ | 173 |
Office and computer equipment |  | 7,082 |  |  | 5,638 |
Software |  | 16,487 |  |  | 15,227 |
Test equipment |  | 347 |  |  | 347 |
Leasehold improvements |  | 2,689 |  |  | 2,689 |
|  | 26,778 |  |  | 24,074 |
Less: Accumulated depreciation |  | (21,847) |  |  | (20,632) |
Add: Assets under development |  | 394 |  |  | 1,518 |
Net property, plant and equipment |  | $ | 5,325 |  |  | $ | 4,960 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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