Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue:
Product sales, net	$ 119	$ 63	$ 302	$ 140
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Other revenue		$ 8	$ 7	$ 15
Total operating revenue	$ 119	71	309	155
Cost of sales:
Cost of product sales	$ 88	$ 67	$ 212	$ 83
Cost, Product and Service [Extensible Enumeration]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 31	$ 4	$ 97	$ 72
Operating expenses:
Research and development	953	1,377	2,717	2,694
Selling, general and administrative	2,461	4,744	5,280	6,939
Amortization expense	47	49	94	106
Total operating expenses	3,461	6,170	8,091	9,739
Operating loss	(3,430)	(6,166)	(7,994)	(9,667)
Other income (expense):
Other income			1
Foreign exchange (loss) gain	(380)	185	(163)	324
Net other income (expense)	(380)	185	(162)	324
Loss before provision for income taxes	(3,810)	(5,981)	(8,156)	(9,343)
Provision for income taxes
Net loss	(3,810)	(5,981)	(8,156)	(9,343)
Other comprehensive income (loss):
Foreign currency translation adjustments	351	(185)	149	(313)
Comprehensive loss	$ (3,459)	$ (6,166)	$ (8,007)	$ (9,656)
Net loss per share
Basic	$ (0.97)	$ (2.58)	$ (2.11)	$ (4.29)
Diluted	$ (0.97)	$ (2.58)	$ (2.11)	$ (4.29)
Weighted average shares outstanding
Basic	3,928,704	2,317,389	3,858,676	2,179,878
Diluted	3,928,704	2,317,389	3,858,676	2,179,878