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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 15,420	$ 4,111	$ 36,307	$ 17,552
Hardware
Disaggregation of Revenue [Line Items]
Revenue	10,539	718
Hardware | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	10,539	718
Service revenue
Disaggregation of Revenue [Line Items]
Revenue	4,881	3,393	15,645	13,482
Service revenue | Partnership Arrangements
Disaggregation of Revenue [Line Items]
Revenue	36	0	$ 51	$ 6
Service revenue | Host Customer Arrangements
Disaggregation of Revenue [Line Items]
Revenue	$ 4,845	$ 3,393

X

- Definition

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.

+ References

No definition available.

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- Definition

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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-Publisher FASB
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