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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Cost of goods sold $ (202) $ (168) $ (314) $ (246)
Gross profit 334 211 610 426
Operating expenses:        
Research and development expenses 3,497 2,223 7,204 5,197
Selling, general and administrative expenses 3,288 2,257 6,584 4,573
Total operating expenses 6,785 4,480 13,788 9,770
Operating loss (6,451) (4,269) (13,178) (9,344)
Change in fair value of the warrant liability, net       (2,832)
Interest expense, net (40) (52) (81) (88)
Other income 61 46 82 128
Net loss (6,430) (4,275) (13,177) (12,136)
Deemed dividend for triggering of warrant down round feature   (55)   (55)
Net loss attributable to common stockholders (6,430) (4,330) (13,177) (12,191)
Net loss (6,430) (4,275) (13,177) (12,136)
Other comprehensive (loss) income:        
Foreign currency translation adjustments (61) (1) 33 65
Total other comprehensive loss $ (6,491) $ (4,276) $ (13,144) $ (12,071)
Common share data:        
Basic loss per common share $ (0.96) $ (1.90) $ (2.00) $ (10.40)
Diluted loss per common share $ (0.96) $ (1.90) $ (2.00) $ (10.40)
Weighted average number of basic shares outstanding 6,681,369 2,273,187 6,589,655 1,171,994
Weighted average number of diluted shares outstanding 6,681,369 2,273,187 6,589,655 1,171,994
Product Revenue [Member]        
Revenue $ 398 $ 262 $ 659 $ 437
Other Revenue [Member]        
Revenue $ 138 $ 117 $ 265 $ 235