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BASIS OF PRESENTATION - Breakdown of net revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Device revenue
Total Device revenue	$ 20,026	$ 11,817	$ 54,517	$ 31,310
Devices [Member]
Device revenue
Purchased	1,618	939	4,121	2,249
Leased	3,683	1,722	8,905	4,675
Total Device revenue	$ 5,301	$ 2,661	$ 13,026	$ 6,924

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