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Government assistance - Economic Incentive Disaster Loan (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Grants recognized as a reduction to operating expenses		$ 176,000	$ 0	$ 1,816,000	$ 0
Economic Incentive Disaster Loan
Debt Instrument [Line Items]
Economic Incentive Disaster Loan	$ 10,000
Grants recognized as a reduction to operating expenses		$ 10,000		$ 10,000

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The amount of government grant recorded as reduction of expenses.

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The cash inflow during the period from the U.S. Small Business Administration from a grant that does not have to be repaid.

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