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BASIS OF PRESENTATION - Breakdown of net revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Device revenue
Total Device revenue	$ 31,022	$ 19,263	$ 55,149	$ 34,491
Devices [Member]
Device revenue
Purchased	2,337	1,223	4,668	2,503
Leased	5,491	3,058	9,525	5,222
Total Device revenue	$ 7,828	$ 4,281	$ 14,193	$ 7,725

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