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Going Concern (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 17, 2019
Mar. 31, 2019
Oct. 09, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Working capital   $ 1,500   $ 1,500   $ 1,500    
Net loss       $ 1,394 $ 2,855 5,792 $ 8,998 $ 13,300
Net cash used in operating activities           $ (6,550) $ (8,641) $ (10,800)
Proceeds from issuance of private placement of equity securities     $ 3,000          
Net proceeds from sale of common stock   $ 1,000            
Subsequent Events                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                
Proceeds from issuance of private placement of equity securities $ 2,000