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Property and equipment
6 Months Ended
Jun. 30, 2016
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment
 
Property and equipment and related accumulated depreciation are as follows (in thousands):
 
 
As of June 30,
 
As of December 31,
 
2016
 
2015
Laboratory equipment
$
7,797

 
$
7,270

Furniture
716

 
712

Computer equipment
292

 
230

Leasehold improvements
2,798

 
2,521

Total property and equipment, gross
11,603

 
10,733

Less: accumulated depreciation
(3,454
)
 
(2,420
)
Total property and equipment, net
$
8,149

 
$
8,313



We recorded depreciation and amortization expense of $0.6 million and $1.1 million for the three and six months ended June 30, 2016, respectively. We recorded depreciation and amortization expense of $0.2 million and $0.4 million for the three and six months ended June 30, 2015, respectively.