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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
The September 2019 Offering [Member]        
Offering costs from issuance of common stock and warrants   $ 1,457   $ 1,457
The April 2019 Offering [Member]        
Offering costs from issuance of common stock and warrants       1,579
Offering costs $ 2,966   $ 2,966 $ 560
Offering costs from issuance of common stock and warrants     $ 1,278