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Inventory (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consisted of the following as of March 31, 2020 and December 31, 2019 (in thousands):
 
 
March 31,
2020
 
December 31,
2019
Raw materials
 
$
4,304

 
$
4,093

Work in process
 
569

 

Finished goods
 
1,129

 
1,230

Total inventories
 
$
6,002

 
$
5,323