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Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Revenues $ 5,484 $ 2,578 $ 9,947 $ 4,633
Operating expenses:        
Cost of revenues 680 592 1,384 1,131
Engineering and product development 489 474 856 913
Sales and marketing 1,779 1,164 3,484 2,153
General and administrative 1,001 902 1,875 1,740
Total operating expenses 3,949 3,132 7,599 5,937
Income (loss) from operations 1,535 (554) 2,348 (1,304)
Interest expense (9) (72) (56) (145)
Related party interest expense (72) (43) (131) (86)
Loss on extinguishment of loans   (179)   (179)
Other expense (1) (2) (2) (8)
Other expense (82) (296) (189) (418)
Net income (loss) $ 1,453 $ (850) $ 2,159 $ (1,722)
Net income (loss) per share:        
Basic (in dollars per share) $ 0.24 $ (0.16) $ 0.36 $ (0.33)
Diluted (in dollars per share) $ 0.19 $ (0.16) $ 0.29 $ (0.33)
Weighted average number of shares used in computing: basic and diluted loss per share        
Basic (in shares) 5,982,711 5,340,234 5,953,818 5,286,179
Diluted (in shares) 7,534,846 5,340,234 7,403,498 5,286,179