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Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2022-01-31","val":0,"accn":"0001540755-22-000040","fy":2023,"fp":"Q1","form":"10-Q","filed":"2022-06-02","frame":"CY2021Q4I"},{"end":"2022-04-30","val":2897000,"accn":"0001540755-22-000040","fy":2023,"fp":"Q1","form":"10-Q","filed":"2022-06-02","frame":"CY2022Q1I"}]}}}}}