Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Apr. 01, 2023
May 12, 2023
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Working capital surplus     $ 200    
Cash     15,300    
Net loss     17,178 $ 11,557  
Net cash used in operating activities     9,503 15,319  
Cash and cash equivalents     15,254   $ 10,235
Unrealized (gain)/loss on equity securities     $ 34 (1,503)  
Stated term     1 year    
Renewal option term     1 year    
Term for students     2 years    
Deferred revenue associated with software license agreements     $ 1,400   1,300
Stock based compensation     329 $ 1,533  
Accumulated deficit     (330,586)   (313,739)
Non-controlling Interest     1,506   $ 1,184
Revision of Prior Period, Reclassification, Adjustment          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Accumulated deficit     1,100    
Non-controlling Interest     1,100    
Sales Agreement | Subsequent Event          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Sale of stock, consideration received on transaction   $ 4,100      
ATM          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Sale of stock, consideration received on transaction     $ 15,400    
ATM | Subsequent Event          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Additional funds $ 3,800