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Property and Equipment, net
9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
 
4. Property and Equipment, net
Property and equipment consisted of the following:
 
   
At September
 
30, 2019
   
At December 31, 2018
 
Laboratory equipment
  $1,538   $1,529 
Computer equipment
   216    185 
Office furniture and equipment
   217    217 
Leasehold improvements
   581    579 
   
 
 
   
 
 
 
Total property and equipment
   2,552    2,510 
Less accumulated depreciation and amortization
   (2,247   (2,116
   
 
 
   
 
 
 
Property and equipment, net
  $305   $394 
   
 
 
   
 
 
 
Depreciation and amortization expense for the three months and nine months ended September 30, 2019, was $44 and $139, respectively. Depreciation and amortization expense for the three months and nine months ended September 30, 2018, was $57 and $175, respectively.