Marketable securities (Details) - USD ($) |
Sep. 30, 2021 |
Dec. 31, 2020 |
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| Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] | ||
| Marketable securities | $ 6,090,885 | |
| Corporate Debt Securities [Member] | ||
| Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] | ||
| Marketable securities | 5,570,483 | |
| Certificates of Deposit [Member] | ||
| Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] | ||
| Marketable securities | $ 520,402 |
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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 Amount of investment in marketable security. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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