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Property and Equipment, net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment, net Property and Equipment, net
The principal categories of property and equipment, net at December 31, 2020 and 2019, respectively, are as follows: 
Property and Equipment, net:20202019
Software, office and computer equipment$1,443 $1,258 
Furniture, fixtures and fittings300 300 
Less - accumulated depreciation(1,384)(1,014)
Total$359 $544 
Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $287, $459 and $811, respectively.