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Property and Equipment
 12 Months Ended
Dec. 31, 2016
Property Plant And Equipment [Abstract]  
Property and Equipment

Note 4. Property and Equipment

The following table presents the detail of property and equipment as of the dates presented:

 

 

 

USEFUL

 

DECEMBER 31,

 

 

 

LIVES

 

2016

 

 

2015

 

 

 

(Years)

 

(in thousands)

 

Laboratory equipment

 

3

 

$

6,687

 

 

$

4,670

 

Computer equipment and software

 

3

 

 

2,529

 

 

 

2,703

 

Furniture and fixtures

 

3-7

 

 

228

 

 

 

193

 

Equipment acquired under capital leases

 

3-5

 

 

6,172

 

 

 

6,165

 

Leasehold improvements

 

Shorter of

lease term or

economic life

 

 

9,540

 

 

 

7,588

 

 

 

 

 

 

25,156

 

 

 

21,319

 

Less: Accumulated depreciation

 

 

 

 

(10,227

)

 

 

(8,968

)

 

 

 

 

$

14,929

 

 

$

12,351

 

 

Depreciation expense, which includes amortization of leased assets, was $2.9 million, $1.9 million and $1.3 million for the years ended December 31, 2016, 2015 and 2014, respectively. The net book value of property and equipment acquired under capital leases was $2.7 million and $3.5 million at December 31, 2016 and 2015, respectively.