CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
NET REVENUE
Total net revenue	$ 31,022	$ 19,263	$ 55,149	$ 34,491
COSTS OF REVENUE AND OPERATING EXPENSES
Costs of revenue - devices and supplies	7,267	4,061	13,153	7,462
Sales and marketing	13,752	6,800	27,579	12,384
General and administrative	6,188	4,317	11,683	8,102
Total costs of revenue and operating expenses	27,207	15,178	52,415	27,948
Income from operations	3,815	4,085	2,734	6,543
Other expense
Interest expense	(45)	(5)	(54)	(9)
Other expense, net	(45)	(5)	(54)	(9)
Income from operations before income taxes	3,770	4,080	2,680	6,534
Income tax expense	962	1,063	578	580
Net Income	$ 2,808	$ 3,017	$ 2,102	$ 5,954
Net income per share:
Basic	$ 0.08	$ 0.09	$ 0.06	$ 0.18
Diluted	$ 0.08	$ 0.09	$ 0.06	$ 0.17
Weighted average basic shares outstanding	34,810	33,283	34,824	33,098
Weighted average diluted shares outstanding	35,583	34,454	35,629	34,329
Devices [Member]
NET REVENUE
Total net revenue	$ 7,828	$ 4,281	$ 14,193	$ 7,725
Supplies [Member]
NET REVENUE
Total net revenue	$ 23,194	$ 14,982	$ 40,956	$ 26,766