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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Service revenue $ 3,605 $ 3,147 $ 7,093 $ 6,155
Product revenue 449 467 828 951
Total revenue 4,054 3,614 7,921 7,106
Operating expenses:        
Cost of service revenue 908 874 1,878 1,751
Cost of product revenue 263 243 483 492
Selling and marketing 1,062 963 2,100 1,862
General and administrative 1,046 997 2,234 2,011
Research and development 244 197 514 409
Total operating expenses 3,523 3,274 7,209 6,525
Income from operations 531 340 712 581
Other income/(expense):        
Interest income 1 2 2 3
Interest expense (22) (3) (31) (8)
Other income/(expense), net 1 3 (29) 8
Total other income/(expense), net (20) 2 (58) 3
Income before income tax 511 342 654 584
Income tax provision (3) (4) (6) (7)
Net income $ 508 $ 338 $ 648 $ 577
Earnings/(loss) per common share:        
Basic $ 0.03 $ 0.02 $ 0.04 $ 0.04
Diluted $ 0.03 $ 0.02 $ 0.04 $ 0.04
Weighted-average common shares outstanding:        
Basic 15,023,929 14,462,722 14,964,138 14,428,694
Diluted 16,671,848 15,508,570 16,485,754 15,339,404