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Property and equipment, net
 9 Months Ended
Sep. 30, 2016
Property, Plant and Equipment [Abstract]  
Property and equipment, net
Property and equipment, net

Property and equipment consisted of the following (in thousands):
 
September 30,
 
December 31,
 
2016
 
2015
 
 
 
 
Computer equipment
$
329

 
$
329

Office and other equipment
301

 
256

Laboratory equipment
442

 
425

Leasehold improvements
51

 
51

Gross property and equipment
1,123

 
1,061

Less: Accumulated depreciation
(586
)
 
(447
)
Property and equipment, net
$
537

 
$
614



The Company incurred immaterial depreciation expense for both the three months ended September 30, 2016 and 2015 and $0.1 million and 0.2 million for both the nine months ended September 30, 2016 and 2015, respectively.