Cash and cash equivalents (Details) - USD ($)	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and cash equivalents
Cash	$ 245,028,791		$ 58,450,680
Cash equivalent	5,000,000		70,999,996
Cash and cash equivalents	$ 250,028,791	$ 260,365,630	$ 129,450,676	$ 37,728,278	$ 5,334,072	$ 8,560,624

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

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The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

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