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REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS - Financial Statements and Footnotes as Adjusted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
BALANCE SHEET                            
Accrued expenses $ 3,414 $ 2,964 $ 3,383 $ 2,787 $ 2,998 $ 2,373   $ 2,964 $ 2,998 $ 3,414 $ 2,787 $ 3,245 $ 3,156  
Accumulated deficit (134,549) (133,825) (132,972) (130,938) (130,140) (128,970)   (133,825) (130,140) (134,549) (130,938) (133,565) (131,585) $ (127,426)
Total stockholders’ equity 16,007 16,353 16,922 17,581 17,683 18,333   16,353 17,683 16,007 17,581 17,276 17,667 19,048
STATEMENT OF OPERATIONS                            
Selling, general and administrative 3,677 3,937 3,995 2,991 3,196 3,019   7,931 6,216 11,609 9,207 15,127 12,707  
Total operating expenses 5,227 5,213 5,303 4,452 4,814 4,623   10,515 9,437 15,743 13,889 19,807 18,721  
Loss from operations (895) (849) (1,381) (798) (1,170) (1,544)   (2,229) (2,714) (3,125) (3,512) (2,276) (4,030)  
Net loss $ (724) $ (853) $ (1,387) $ (798) $ (1,170) $ (1,544) $ (8,007) $ (2,240) $ (2,714) $ (2,964) $ (3,512) $ (1,980) $ (4,159)  
Loss per common share                            
Basic (in dollars per share) $ (0.04) $ (0.04) $ (0.07) $ (0.04) $ (0.06) $ (0.08)   $ (0.12) $ (0.14) $ (0.15) $ (0.19) $ (0.10) $ (0.22)  
Diluted (in dollars per share) $ (0.04) $ (0.04) $ (0.07) $ (0.04) $ (0.06) $ (0.08)   $ (0.12) $ (0.14) $ (0.15) $ (0.19) $ (0.10) $ (0.22)  
STATEMENT OF STOCKHOLDERS’ EQUITY                            
Net loss $ (724) $ (853) $ (1,387) $ (798) $ (1,170) $ (1,544) (8,007) $ (2,240) $ (2,714) $ (2,964) $ (3,512) $ (1,980) $ (4,159)  
Accumulated deficit (134,549) (133,825) (132,972) (130,938) (130,140) (128,970)   (133,825) (130,140) (134,549) (130,938) (133,565) (131,585) (127,426)
Total Stockholders’ Equity 16,007 16,353 16,922 17,581 17,683 18,333   16,353 17,683 16,007 17,581 17,276 17,667 19,048
STATEMENT OF CASH FLOWS                            
Net loss (724) (853) (1,387) (798) (1,170) (1,544) (8,007) (2,240) (2,714) (2,964) (3,512) (1,980) (4,159)  
Increase (decrease) in accounts payable and accrued expenses     783     (1,073)   125 (349) 431 (366) $ 616 (260)  
As Previously Reported                            
BALANCE SHEET                            
Accrued expenses 2,350 1,980 2,475 2,036 2,321 1,768   1,980 2,321 2,350 2,036   2,319  
Accumulated deficit (133,485) (132,841) (132,064) (130,187) (129,463) (128,365)   (132,841) (129,463) (133,485) (130,187)   (130,748) (126,897)
Total stockholders’ equity 17,071 17,337 17,830 18,332 18,360 18,938   17,337 18,360 17,071 18,332   18,504 19,577
STATEMENT OF OPERATIONS                            
Selling, general and administrative 3,597 3,861 3,924 2,917 3,124 2,943   7,784 6,068 11,382 8,985   12,399  
Total operating expenses 5,147 5,137 5,232 4,378 4,742 4,547   10,368 9,289 15,516 13,667   18,413  
Loss from operations (815) (773) (1,310) (724) (1,098) (1,468)   (2,082) (2,566) (2,898) (3,290)   (3,722)  
Net loss $ (644) $ (777) $ (1,316) $ (724) $ (1,098) $ (1,468) (7,478) $ (2,093) $ (2,566) $ (2,737) $ (3,290)   $ (3,851)  
Loss per common share                            
Basic (in dollars per share) $ (0.03) $ (0.04) $ (0.07) $ (0.04) $ (0.06) $ (0.08)   $ (0.11) $ (0.14) $ (0.14) $ (0.17)   $ (0.20)  
Diluted (in dollars per share) $ (0.03) $ (0.04) $ (0.07) $ (0.04) $ (0.06) $ (0.08)   $ (0.11) $ (0.14) $ (0.14) $ (0.17)   $ (0.20)  
STATEMENT OF STOCKHOLDERS’ EQUITY                            
Net loss $ (644) $ (777) $ (1,316) $ (724) $ (1,098) $ (1,468) (7,478) $ (2,093) $ (2,566) $ (2,737) $ (3,290)   $ (3,851)  
Accumulated deficit (133,485) (132,841) (132,064) (130,187) (129,463) (128,365)   (132,841) (129,463) (133,485) (130,187)   (130,748) (126,897)
Total Stockholders’ Equity 17,071 17,337 17,830 18,332 18,360 18,938   17,337 18,360 17,071 18,332   18,504 19,577
STATEMENT OF CASH FLOWS                            
Net loss (644) (777) (1,316) (724) (1,098) (1,468) (7,478) (2,093) (2,566) (2,737) (3,290)   (3,851)  
Increase (decrease) in accounts payable and accrued expenses     712     (1,149)   (22) (497) 204 (588)   (568)  
Adjustment                            
BALANCE SHEET                            
Accrued expenses 1,064 984 908 751 677 605   984 677 1,064 751   837  
Accumulated deficit (1,064) (984) (908) (751) (677) (605)   (984) (677) (1,064) (751)   (837) (529)
Total stockholders’ equity (1,064) (984) (908) (751) (677) (605)   (984) (677) (1,064) (751)   (837) (529)
STATEMENT OF OPERATIONS                            
Selling, general and administrative 80 76 71 74 72 76   147 148 227 222   308  
Total operating expenses 80 76 71 74 72 76   147 148 227 222   308  
Loss from operations (80) (76) (71) (74) (72) (76)   (147) (148) (227) (222)   (308)  
Net loss $ (80) $ (76) $ (71) $ (74) $ (72) $ (76) (529) $ (147) $ (148) $ (227) $ (222)   $ (308)  
Loss per common share                            
Basic (in dollars per share) $ (0.01) $ 0 $ 0 $ 0 $ 0 $ 0   $ (0.01) $ 0 $ (0.01) $ (0.02)   $ (0.02)  
Diluted (in dollars per share) $ (0.01) $ 0 $ 0 $ 0 $ 0 $ 0   $ (0.01) $ 0 $ (0.01) $ (0.02)   $ (0.02)  
STATEMENT OF STOCKHOLDERS’ EQUITY                            
Net loss $ (80) $ (76) $ (71) $ (74) $ (72) $ (76) (529) $ (147) $ (148) $ (227) $ (222)   $ (308)  
Accumulated deficit (1,064) (984) (908) (751) (677) (605)   (984) (677) (1,064) (751)   (837) (529)
Total Stockholders’ Equity (1,064) (984) (908) (751) (677) (605)   (984) (677) (1,064) (751)   (837) $ (529)
STATEMENT OF CASH FLOWS                            
Net loss $ (80) $ (76) (71) $ (74) $ (72) (76) $ (529) (147) (148) (227) (222)   (308)  
Increase (decrease) in accounts payable and accrued expenses     $ 71     $ 76   $ 147 $ 148 $ 227 $ 222   $ 308