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Risks and Uncertainties (Details) - USD ($)
$ in Thousands
3 Months Ended 22 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Dec. 31, 2022
Jul. 15, 2019
Concentration Risk [Line Items]          
Cash and cash equivalents $ 26,882     $ 27,273  
Accumulated deficit $ 303,139     $ 311,207  
At-the-market offering          
Concentration Risk [Line Items]          
Number of shares issued in transaction (in shares) 1,078,622   11,420,579    
Consideration received on sale of stock $ 916   $ 40,656    
Payments for stock issuance costs 77 $ 62 $ 2,130    
Remaining amount available for offering $ 32,422        
Senior secured notes due 2025          
Concentration Risk [Line Items]          
Interest rate         12.50%
Senior secured notes due 2025 | Senior notes          
Concentration Risk [Line Items]          
Interest rate         12.50%