Quarterly report pursuant to Section 13 or 15(d)

Description of the Business and Financial Condition (Details)

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Description of the Business and Financial Condition (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
customer
shares
May 31, 2021
USD ($)
Mar. 31, 2024
USD ($)
customer
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2020
USD ($)
investor
Jan. 31, 2020
investor
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Number of customers (more than) | customer 50   50        
Cumulative deficit $ 176,602   $ 176,602   $ 172,456    
Net cash used in operations     3,840 $ 5,680 13,700    
Net proceeds from offering     16,183 $ 0      
Secured convertible notes 0   0   9,949    
2020 senior secured convertible note payable, net $ 9,964   9,964        
Public Offering              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Public offering (in shares) | shares 2,653,848            
Net proceeds from offering $ 16,200            
Security Purchase Agreement | Convertible Debt              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Debt instrument, number of investors | investor           2  
Secured convertible notes           $ 25,000  
Debt instrument, conversion amount           $ 15,000  
Security Purchase Agreement | Convertible Debt | First Closing Notes              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Debt instrument, number of investors | investor             2
Secured convertible notes 40   40   100    
Debt instrument, conversion amount   $ 7,500          
Security Purchase Agreement | Convertible Debt | First Closing Notes | Investor              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
2020 senior secured convertible note payable, net $ 10,000   $ 10,000   $ 10,000