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Balance Sheet Components (Tables)
 6 Months Ended
Jun. 30, 2018
Balance Sheet Components [Abstract]  
Components of Inventory



 

 

 

 

 



 

 

 

 

 



June 30,

 

December 31,

(in thousands)

2018

 

2017

Purchased materials

$

 6,877 

 

$

 8,884 

Work in process

 

 10,358 

 

 

 9,994 

Finished goods

 

 6,205 

 

 

 4,187 

Inventory

$

 23,440 

 

$

 23,065