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Property and Equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and equipment:
Property and equipment, summarized by major category, consist of the following as of December 31:
20192018
Machinery & equipment$5,635  $5,635  
Right of use, building and lease720  —  
Computer equipment & software437  406  
Office furniture & equipment174  155  
Leasehold improvements43  43  
Idle equipment679  679  
Total7,688  6,918  
Less accumulated depreciation(5,613) (3,846) 
Total property, plant & equipment, net$2,075  $3,072  
Depreciation expense for years ended December 31, 2019, 2018 and 2017 was approximately $0.3 million, $1.0 million and $0.7 million, respectively. The Company evaluated and adjusted the estimated useful life of certain equipment related to the production of BUNAVAIL that resulted in the additional depreciation expense. As such, the 2019 depreciation expense includes an additional $1.5 million associated with accelerated depreciation for BUNAVAIL specific equipment.