Concentration of credit risk and off-balance sheet risk (Q3) (Details) |
9 Months Ended | 12 Months Ended | |||
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Sep. 30, 2020 |
Dec. 31, 2019 |
Sep. 30, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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Revenues | |||||
Concentration Risk [Line Items] | |||||
Concentration risk percentage | 10.00% | 10.00% | |||
Revenues | Customer concentration risk | Two customers | |||||
Concentration Risk [Line Items] | |||||
Concentration risk percentage | 35.00% | ||||
Accounts receivable | |||||
Concentration Risk [Line Items] | |||||
Concentration risk percentage | 44.00% | 68.00% | |||
Accounts receivable | Customer concentration risk | Three customers | |||||
Concentration Risk [Line Items] | |||||
Concentration risk percentage | 70.00% | ||||
Accounts receivable | Customer concentration risk | One customer | |||||
Concentration Risk [Line Items] | |||||
Concentration risk percentage | 44.00% |
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- 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. No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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