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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, consists of the following

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

 

(in thousands)

 

Furniture and equipment

 

$

13,626

 

 

$

7,231

 

Software

 

 

108

 

 

 

43

 

Leasehold improvements

 

 

16,029

 

 

 

1,964

 

Fixed assets in progress

 

 

1,988

 

 

 

1,863

 

Total

 

 

31,751

 

 

 

11,101

 

Less accumulated depreciation and amortization

 

 

(4,417

)

 

 

(2,494

)

Property and equipment, net

 

$

27,334

 

 

$

8,607

 

 

Leasehold improvements made during the years ended December 31, 2017 and 2016 consisted of costs related to the Company’s leased facilities in Cambridge, Massachusetts and Lexington, Massachusetts.

Depreciation and amortization expense was $2.2 million, $0.8 million and $0.6 million for the years ended December 31, 2017, 2016 and 2015, respectively.