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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories

7. Inventories

 

Inventories consisted of the following at March 31, 2018 (unaudited) and December 31, 2017 (in thousands):  

 

 

March 31, 2018

 

 

December 31, 2017

 

Raw materials

$

669

 

 

$

519

 

Work-in-process

 

1,344

 

 

 

886

 

 

 

2,013

 

 

 

1,405

 

Less: allowance

 

(77

)

 

 

(78

)

Total inventories

$

1,936

 

 

$

1,327