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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total revenue	$ 36,759	$ 31,022	$ 67,842	$ 55,149
Devices
Purchased	2,268	2,337	4,457	4,668
Leased	7,237	5,491	11,773	9,525
Total revenue	9,505	7,828	16,230	14,193
Supplies
Total revenue	$ 27,254	$ 23,194	$ 51,612	$ 40,956

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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