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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment [Abstract]  
Property and Equipment, Net

3. Property and Equipment, Net

Property and equipment, net consisted of the following:

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

 

(in thousands)

 

Laboratory equipment

 

$

16,704

 

 

$

9,901

 

Office furniture and equipment

 

960

 

 

 

690

 

Computer equipment

 

845

 

 

 

703

 

Leasehold improvements

 

656

 

 

 

616

 

Computer software

 

436

 

 

 

148

 

Property and equipment

 

 

19,601

 

 

 

12,058

 

Less: accumulated depreciation and amortization

 

 

(4,329

)

 

 

(1,430

)

Property and equipment, net

 

$

15,272

 

 

$

10,628

 

 

Depreciation and amortization expense was $3.0 million, $1.1 million and $0.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.