Inventories (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Raw materials	$	884	$	547
Work in process		60		270
Finished goods		53		60
Total inventories	$	997	$	877

Inventories consisted of the following (in thousands):

	December 31,
	2020		2019
Raw materials	$	547	$	977
Work in process		270		215
Finished goods		60		100
Inventories	$	877	$	1,292