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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 4. PROPERTY, PLANT AND EQUIPMENT Property, plant, and equipment consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
Land | ​ | $ | 565 | ​ | $ | 565
Building and leasehold improvements | ​ | ​ | 13,013 | ​ | ​ | 12,890
Equipment and fixtures | ​ | ​ | 20,955 | ​ | ​ | 17,739
Software | ​ | ​ | 20,047 | ​ | ​ | 17,716
Vehicles | ​ | ​ | 145 | ​ | ​ | 145
Property, plant and equipment - gross | ​ | ​ | 54,725 | ​ | ​ | 49,055
Less: accumulated depreciation | ​ | ​ | (27,092) | ​ | ​ | (23,016)
Property, plant and equipment - net | ​ | $ | 27,633 | ​ | $ | 26,039
​ Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $4.1 million, $3.7 million and $3.6 million, respectively.

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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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