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Segment Information - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Allowance for credit loss	$ 74,000	$ 136,000
Net revenue, before excise taxes	54,353,000	25,639,000	$ 13,234,000
United States
Segment Reporting Information [Line Items]
Allowance for credit loss	65,000	12,000
Rest of World
Segment Reporting Information [Line Items]
Allowance for credit loss	9,000	124,000	0
Four Major Customers | Rest of World
Segment Reporting Information [Line Items]
Net revenue, before excise taxes	$ 34,295,000
Four Major Customers | Rest of World | Customer Concentration Risk | Revenue Benchmark
Segment Reporting Information [Line Items]
Concentration risk, percentage	63.00%
Two Major Customers | Rest of World
Segment Reporting Information [Line Items]
Net revenue, before excise taxes		$ 7,597,000
Two Major Customers | Rest of World | Customer Concentration Risk | Revenue Benchmark
Segment Reporting Information [Line Items]
Concentration risk, percentage		32.00%
One Major Customer | Rest of World
Segment Reporting Information [Line Items]
Net revenue, before excise taxes			$ 2,186,000
One Major Customer | Rest of World | Customer Concentration Risk | Revenue Benchmark
Segment Reporting Information [Line Items]
Concentration risk, percentage			17.00%

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Amount of allowance for credit loss on accounts receivable, classified as current.

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