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Property and Equipment
 9 Months Ended
Sep. 30, 2017
Property Plant And Equipment [Abstract]  
Property and Equipment

9.

Property and Equipment

Property and equipment and related accumulated depreciation and amortization are as follows (in thousands):

 

 

 

 

September 30, 2017

 

 

December 31, 2016

 

Lab equipment

 

$

34,738

 

 

$

34,727

 

Computer equipment

 

 

11,688

 

 

 

11,534

 

Software

 

 

9,640

 

 

 

5,429

 

Furniture and office equipment

 

 

3,854

 

 

 

3,638

 

Leasehold improvements

 

 

25,992

 

 

 

24,730

 

Construction in progress

 

 

5,206

 

 

 

4,512

 

 

 

 

91,118

 

 

 

84,570

 

Less: accumulated depreciation and amortization

 

 

(51,982

)

 

 

(43,084

)

 

 

$

39,136

 

 

$

41,486

 

 

Depreciation and amortization expense for the three and nine months ended September 30, 2017 was $4,666,000 and $13,507,000, respectively, and for the three and nine months ended September 30, 2016 was $4,292,000 and $11,528,000, respectively. The Company classifies capitalized internal use software in lab equipment, computer equipment and software based on its intended use.