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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 39,833	$ 9,172	$ 74,591	$ 17,661
Hardware
Disaggregation of Revenue [Line Items]
Revenue	34,886	5,523	59,609	6,950
Hardware | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	34,886	5,523	59,609	6,950
Service
Disaggregation of Revenue [Line Items]
Revenue	4,947	3,649	14,982	10,711
Service | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	33	0	112	0
Service | Host Customer Arrangements
Disaggregation of Revenue [Line Items]
Revenue	$ 4,914	$ 3,649	$ 14,870	$ 10,711

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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