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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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- Definition The amount of government grant recorded as reduction of expenses. + References No definition available. + Details
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- Definition The cash inflow during the period from the U.S. Small Business Administration from a grant that does not have to be repaid. + References No definition available. + Details
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- Details
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