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Balance Sheet Components (Tables)
9 Months Ended
Sep. 30, 2020
Balance Sheet Components [Abstract]  
Components of Inventory

September 30,

December 31,

(in thousands)

2020

2019

Purchased materials

$

5,198

$

3,966

Work in process

5,439

4,594

Finished goods

5,303

4,752

Inventory

$

15,940

$

13,312