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Balance Sheet Components
 12 Months Ended
Dec. 31, 2018
Balance Sheet Components [Abstract]  
Balance Sheet Components

NOTE 5. BALANCE SHEET COMPONENTS 

Inventory

As of December 31, 2018 and 2017, our inventory consisted of the following components: 





 

 

 

 

 



 

 

 

 

 



December 31,

(in thousands)

2018

 

2017

Purchased materials

$

 6,222 

 

$

 8,884 

Work in process

 

 7,341 

 

 

 9,994 

Finished goods

 

 4,315 

 

 

 4,187 

Inventory

$

 17,878 

 

$

 23,065 



Property and Equipment, Net

As of December 31, 2018 and 2017, our property and equipment, net, consisted of the following components: 





 

 

 

 

 



 

 

 

 

 



December 31,

(in thousands)

2018

 

2017

Laboratory equipment and machinery

$

 24,111 

 

$

 24,703 

Leasehold improvements

 

 29,821 

 

 

 29,728 

Computer equipment

 

 9,484 

 

 

 8,301 

Software

 

 4,734 

 

 

 4,615 

Furniture and fixtures

 

 2,422 

 

 

 2,382 

Construction in progress

 

 608 

 

 

 385 



 

 71,180 

 

 

 70,114 

Less: Accumulated depreciation

 

 (37,107)

 

 

 (32,194)

Property and equipment, net

$

 34,073 

 

$

 37,920 



Depreciation expense during the years ended December 31, 2018, 2017 and 2016 was $7.2 million, $8.4 million and $3.9 million, respectively.

Accrued Expenses

As of December 31, 2018 and 2017, our accrued expenses consisted of the following components:





 

 

 

 

 



 

 

 

 

 



December 31,

(in thousands)

2018

 

2017

Salaries and benefits

$

 8,523 

 

$

 7,570 

Accrued product development costs

 

 561 

 

 

 2,034 

Accrued Tenant Improvements for Menlo Park building

 

 694 

 

 

 —

Inventory accrual

 

 499 

 

 

 626 

Accrued professional services and legal fees

 

 1,588 

 

 

 1,368 

Other

 

 958 

 

 

 1,020 

Accrued expenses

$

 12,823 

 

$

 12,618