Concentration of credit risk and off-balance sheet risk (Details) - Customer Concentration Risk [Member] - Customer |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2020 |
Dec. 31, 2019 |
|
| Gross Sales [Member] | ||
| Concentration Risk [Line Items] | ||
| Number of customers | 4 | |
| Concentration risk percentage | 70.00% | |
| Accounts Receivable [Member] | ||
| Concentration Risk [Line Items] | ||
| Number of customers | 2 | 1 |
| Concentration risk percentage | 79.00% | 44.00% |
| X | ||||||||||
- Definition Refers to the number of customers in which the Company transacts business. No definition available.
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|