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Government assistance - PPP Loan (Details) - USD ($)		12 Months Ended
	Apr. 20, 2020	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Grants recognized as a reduction to operating expenses		$ 1,816,000
Interest expense		1,193,000	$ 1,285,000
Paycheck Protection Program, CARES Act [Member]
Debt Instrument [Line Items]
Face amount of loan	$ 1,806,000
Stated interest rate (as percentage)	1.00%
Term of loan	2 years
Grants recognized as a reduction to operating expenses		1,806,000
Interest expense		$ 0

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