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v3.22.1

Property, Plant and Equipment | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment |  |
Property, Plant and Equipment | 6.Property, Plant and Equipment Property, plant and equipment consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | December 31,
(in thousands) | ​ | 2022 | ​ | 2021
Furniture and fixtures | ​ | $ | 173 | ​ | $ | 173
Office and computer equipment | ​ |  | 5,638 | ​ |  | 5,638
Software | ​ |  | 16,423 | ​ |  | 15,227
Test equipment | ​ |  | 347 | ​ |  | 347
Leasehold improvements | ​ |  | 2,689 | ​ |  | 2,689
​ | ​ |  | 25,270 | ​ |  | 24,074
Less: Accumulated depreciation | ​ |  | (21,209) | ​ |  | (20,632)
Add: Assets under development | ​ |  | 1,508 | ​ |  | 1,518
Net property, plant and equipment | ​ | $ | 5,569 | ​ | $ | 4,960
​ |
4. | Property, Plant and Equipment
Property, plant and equipment consisted of the following at December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Furniture and fixtures | ​ | $ | 173 | ​ | $ | 173
Office and computer equipment | ​ |  | 5,638 | ​ |  | 5,436
Software | ​ |  | 15,227 | ​ |  | 13,251
Test equipment | ​ |  | 347 | ​ |  | 347
Leasehold improvements | ​ |  | 2,689 | ​ |  | 2,689
​ | ​ |  | 24,074 | ​ |  | 21,896
Less: Accumulated depreciation | ​ |  | (20,632) | ​ |  | (18,614)
Add: Assets under development | ​ |  | 1,518 | ​ |  | 1,743
Net property, plant and equipment | ​ | $ | 4,960 | ​ | $ | 5,025
​

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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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://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 http://asc.fasb.org/extlink&oid=120429125&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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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