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The Company and Basis of Presentation (Details) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 12 Months Ended
Apr. 13, 2020
Jul. 24, 2019
Jun. 30, 2019
Dec. 31, 2018
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Sale of Stock              
Cash         $ 9,799 $ 13,908 $ 1,618
Accumulated deficit         $ (41,596) $ (36,866)  
Redeemable Convertible Preferred Stock              
Sale of Stock              
Net proceeds       $ 16,800      
Registered Offering | Subsequent Event              
Sale of Stock              
Shares issued (in shares) 750,000            
Offering shares (Per share) $ 10            
Gross proceeds $ 7,500            
Convertible notes              
Sale of Stock              
Net proceeds       $ 500      
Series B Redeemable Convertible Preferred Stock              
Sale of Stock              
Net proceeds     $ 24,200        
Merger Agreement with NeuroBo              
Sale of Stock              
Percentage of interest held by our exiting shareholders   96.20%          
Reverse stock split, ratio   1.1431