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Restatement of Prior Financial Information - CONSOLIDATED BALANCE SHEETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
ASSETS              
Non-current deposits $ 3,465 $ 3,465 $ 3,609 $ 3,529 $ 2,100 $ 1,803  
Total Assets 28,050 31,570 35,895 40,178 43,136 45,293  
LIABILITIES AND STOCKHOLDERS' EQUITY              
Accrued and other current liabilities 4,950 3,489 2,940 3,473 3,296 2,140  
Total current liabilities 7,511 4,472 5,145 6,323 5,413 3,655  
Total liabilities 7,617 4,579 5,258 6,338 5,443 3,699  
Accumulated deficit (405,727) (398,308)   (388,637) (384,529) (379,434)  
Total stockholders' equity 15,939 22,497 29,532 33,840 37,693 41,594 $ 33,259
Total liabilities and stockholders' equity 28,050 31,570 35,895 40,178 43,136 45,293  
Error in the accounting treatment of contract deposit-related invoices.              
LIABILITIES AND STOCKHOLDERS' EQUITY              
Total stockholders' equity     29,532 33,840 37,693    
Error in the accounting treatment of contract deposit-related invoices. | As previously reported              
ASSETS              
Non-current deposits 2,916 2,916 3,060 2,980 1,551 1,509  
Total Assets 27,501 31,021 35,346 39,629 42,587 44,999  
LIABILITIES AND STOCKHOLDERS' EQUITY              
Accrued and other current liabilities 4,831 3,370 2,821 3,354 3,177 2,076  
Total current liabilities 7,392 4,353 5,026 6,204 5,294 3,591  
Total liabilities 7,498 4,460 5,139 6,219 5,324 3,635  
Accumulated deficit (406,157) (398,738)   (389,067) (384,959) (379,664)  
Total stockholders' equity 15,509 22,067 30,207 33,410 37,263 41,364  
Total liabilities and stockholders' equity 27,501 31,021 35,346 39,629 42,587 44,999  
Error in the accounting treatment of contract deposit-related invoices. | Adjustments              
ASSETS              
Non-current deposits 549 549 549 549 549 294  
Total Assets 549 549 549 549 549 294  
LIABILITIES AND STOCKHOLDERS' EQUITY              
Accrued and other current liabilities 119 119 119 119 119 64  
Total current liabilities 119 119 119 119 119 64  
Total liabilities 119 119 119 119 119 64  
Accumulated deficit 430 430   430 430 230  
Total stockholders' equity 430 430 (675) 430 430 230  
Total liabilities and stockholders' equity $ 549 $ 549 $ 549 $ 549 $ 549 $ 294