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Inventory
 12 Months Ended
Dec. 31, 2018
Inventory  
Inventory

3. Inventory

Inventory consists of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

As of

 

 

December 31,

 

    

2018

    

2017

Raw materials

 

$

1,546

 

$

1,032

Work in process

 

 

2,331

 

 

968

Finished goods

 

 

2,068

 

 

1,571

Total

 

$

5,945

 

$

3,571

 

Inventory comprises commercial instruments, assays, and the materials required to manufacture assays.