CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
NET REVENUE
Total net revenue	$ 34,786	$ 20,026	$ 89,935	$ 54,517
COSTS OF REVENUE AND OPERATING EXPENSES
Costs of revenue - devices and supplies	6,837	4,296	19,990	11,758
Sales and marketing	13,083	9,425	40,662	21,817
General and administrative	6,820	4,896	18,503	12,990
Total costs of revenue and operating expenses	26,740	18,617	79,155	46,565
Income from operations	8,046	1,409	10,780	7,952
Other expense
Interest expense	(18)	(5)	(72)	(14)
Other expense, net	(18)	(5)	(72)	(14)
Income from operations before income taxes	8,028	1,404	10,708	7,938
Income tax expense	1,921	71	2,499	651
Net Income	$ 6,107	$ 1,333	$ 8,209	$ 7,287
Net income per share:
Basic	$ 0.18	$ 0.04	$ 0.24	$ 0.22
Diluted	$ 0.17	$ 0.04	$ 0.23	$ 0.21
Weighted average basic shares outstanding	34,768	34,486	34,805	33,564
Weighted average diluted shares outstanding	35,493	35,476	35,583	34,715
Devices [Member]
NET REVENUE
Total net revenue	$ 9,071	$ 5,301	$ 23,264	$ 13,026
Supplies [Member]
NET REVENUE
Total net revenue	$ 25,715	$ 14,725	$ 66,671	$ 41,491