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Property and Equipment, Net
 9 Months Ended
Sep. 30, 2015
Property Plant And Equipment [Abstract]  
Property and Equipment, Net

4.

Property and Equipment, Net

Property and equipment, net consisted of the following:

 

 

 

September 30,

2015

 

 

December 31,

2014

 

Laboratory equipment

 

$

2,700

 

 

$

1,260

 

Computer equipment

 

 

292

 

 

 

115

 

Furniture and office equipment

 

 

236

 

 

 

58

 

Leasehold improvements

 

 

1,856

 

 

 

114

 

Construction in progress

 

 

136

 

 

 

—

 

 

 

 

5,220

 

 

 

1,547

 

Less: Accumulated depreciation and amortization

 

 

(677

)

 

 

(283

)

 

 

$

4,543

 

 

$

1,264

 

 

Construction in progress at September 30, 2015 was comprised primarily of laboratory equipment purchased in connection with the build-out of laboratory space in one of our Cambridge, Massachusetts facilities.

Depreciation and amortization expense was $182, $394, $47 and $113 for the three and nine months ended September 30, 2015 and 2014, respectively.