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Organization and Nature of Business (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Production information      
Cash, cash equivalents and marketable securities $ 68,115    
Accumulated deficit $ 480,710   $ 453,527
Term Loan Facility      
Production information      
Loan borrowed   $ 11,000