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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 19,337	$ 4,379	$ 34,758	$ 8,489
Hardware
Disaggregation of Revenue [Line Items]
Revenue	14,184	709	24,723	1,427
Hardware | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	14,184	709	24,723	1,427
Service
Disaggregation of Revenue [Line Items]
Revenue	5,153	3,670	10,035	7,062
Service | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	42	0	79	0
Service | Host Customer Arrangements
Disaggregation of Revenue [Line Items]
Revenue	$ 5,111	$ 3,670	$ 9,956	$ 7,062

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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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