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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Statement of Cash Flows [Abstract]      
Restricted cash and cash equivalents, current $ 200    
Restricted cash, noncurrent   $ 1,000 $ 1,000