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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]    
Revenue $ 29,069 $ 25,042
Cost of goods sold 16,510 13,849
Gross profit 12,559 11,193
Operating expenses:    
Sales and marketing 6,728 7,935
Research and product development 5,512 5,775
General and administrative 5,886 6,045
Total operating expenses 18,126 19,755
Operating loss (5,567) (8,562)
Interest expense (436) (26)
Other income, net 79 236
Loss before income taxes (5,924) (8,352)
Provision for (benefit from) income taxes (6,429) 56
Net income (loss) $ 505 $ (8,408)
Basic income (loss) per common share (in dollars per share) $ 0.03 $ (0.51)
Diluted income (loss) per common share (in dollars per share) $ 0.03 $ (0.51)
Basic weighted average shares outstanding (in shares) 17,271,629 16,638,580
Diluted weighted average shares outstanding (in shares) 17,325,351 16,638,580
Comprehensive income (loss):    
Net income (loss) $ 505 $ (8,408)
Other comprehensive income (loss):    
Unrealized gain (loss) on available-for-sale securities, net of tax 8 68
Change in foreign currency translation adjustment (18) (63)
Comprehensive income (loss) $ 495 $ (8,403)