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Restatement of Prior Financial Information - CONSOLIDATED BALANCE SHEETS (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
ASSETS                
Non-current deposits $ 1,259 $ 1,549 $ 3,465 $ 3,465        
Total Assets 12,497 16,991 22,609 28,050        
LIABILITIES AND STOCKHOLDERS' EQUITY                
Accrued and other current liabilities 6,577 4,696 4,948 4,950        
Total current liabilities 8,148 6,865 7,457 7,511        
Total liabilities 8,200 6,931 7,537 7,617        
Additional Paid-In Capital 428,464 424,737   422,973        
Accumulated deficit (423,011) (416,979) (411,531) (405,727)        
Temporary equity 0 3,389   4,494        
Total stockholders' equity 4,297 6,671 10,578 15,939 $ 22,497 $ 29,532 $ 33,840 $ 37,693
Total liabilities and stockholders' equity $ 12,497 16,991 22,609 $ 28,050        
As previously reported                
ASSETS                
Non-current deposits   1,000 2,916          
Total Assets   16,442 22,060          
LIABILITIES AND STOCKHOLDERS' EQUITY                
Accrued and other current liabilities   4,577 4,829          
Total current liabilities   6,746 7,338          
Total liabilities   6,812 7,418          
Additional Paid-In Capital   423,633            
Accumulated deficit   (417,409) (411,961)          
Temporary equity   4,494            
Total stockholders' equity   5,136 10,148          
Total liabilities and stockholders' equity   16,442 22,060          
Adjustments                
ASSETS                
Non-current deposits   549 549          
Total Assets   549 549          
LIABILITIES AND STOCKHOLDERS' EQUITY                
Accrued and other current liabilities   119 119          
Total current liabilities   119 119          
Total liabilities   119 119          
Additional Paid-In Capital   1,104            
Accumulated deficit   430 430          
Temporary equity   (1,105)            
Total stockholders' equity   1,535 430          
Total liabilities and stockholders' equity   $ 549 $ 549