Annual report pursuant to Section 13 and 15(d)

Note 12 - Restatement of Quarterly Financial Information (Unaudited) - Restatement (Details)

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Note 12 - Restatement of Quarterly Financial Information (Unaudited) - Restatement (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Total assets $ 27,242,000 $ 27,242,000 $ 25,328,000 $ 30,210,000  
Net loss (9,430,000) (23,502,000) (30,330,000) (85,451,000)  
Total shareholders ’ equity (deficit) 16,615,000 16,615,000 9,990,000 19,204,000  
Total liabilities $ 10,627,000 $ 10,627,000 $ 15,338,000 $ 11,006,000  
Basic and diluted net loss per common share (in dollars per share) $ (3.19) $ (10.25) $ (13.67) [1] $ (45.95) [1]  
Weighted-average number of shares outstanding, basic and diluted (in shares) 2,957,271 2,293,191 2,799,044 1,859,474  
Preferred stock, par value $0.001 per share; $ 0 $ 0 $ 0 $ 0  
Common stock, par value $0.001 per share; 81,000 81,000 81,000 47,000  
Additional paid-in-capital 250,779,000 250,779,000 258,923,000 229,900,000  
Accumulated deficit (234,245,000) (234,245,000) (249,014,000) (210,743,000)  
Total liabilities and shareholders ’ equity (deficit) 27,242,000 27,242,000 25,328,000 30,210,000  
Additional Paid-in Capital [Member]          
Total shareholders ’ equity (deficit) 250,779,000 250,779,000 258,923,000 229,900,000 $ 215,943,000
Retained Earnings [Member]          
Net loss     (30,330,000) (85,451,000)  
Total shareholders ’ equity (deficit) (234,245,000) (234,245,000) $ (249,014,000) $ (210,743,000) $ (125,292,000)
Previously Reported [Member]          
Total assets 27,242,000 27,242,000      
Net loss (2,984,000) (17,056,000)      
Total shareholders ’ equity (deficit) 16,615,000 16,615,000      
Total liabilities $ 10,627,000 $ 10,627,000      
Basic and diluted net loss per common share (in dollars per share) $ (1.01) $ (7.44)      
Weighted-average number of shares outstanding, basic and diluted (in shares) 2,957,271 2,293,191      
Preferred stock, par value $0.001 per share; $ 0 $ 0      
Common stock, par value $0.001 per share; 81,000 81,000      
Additional paid-in-capital 244,333,000 244,333,000      
Accumulated deficit (227,799,000) (227,799,000)      
Total liabilities and shareholders ’ equity (deficit) 27,242,000 27,242,000      
Previously Reported [Member] | Additional Paid-in Capital [Member]          
Total shareholders ’ equity (deficit) 244,333,000 244,333,000      
Previously Reported [Member] | Retained Earnings [Member]          
Total shareholders ’ equity (deficit) (227,799,000) (227,799,000)      
Revision of Prior Period, Error Correction, Adjustment [Member]          
Total assets 0 0      
Net loss [2] (6,446,000) (6,446,000)      
Total shareholders ’ equity (deficit) 0 0      
Total liabilities $ 0 $ 0      
Basic and diluted net loss per common share (in dollars per share) $ (2.18) $ (2.81)      
Weighted-average number of shares outstanding, basic and diluted (in shares) 2,957,271 2,293,191      
Preferred stock, par value $0.001 per share; $ 0 $ 0      
Common stock, par value $0.001 per share; 0 0      
Additional paid-in-capital [2] 6,446,000 6,446,000      
Accumulated deficit [2] (6,446,000) (6,446,000)      
Total liabilities and shareholders ’ equity (deficit) 0 0      
Revision of Prior Period, Error Correction, Adjustment [Member] | Additional Paid-in Capital [Member]          
Total shareholders ’ equity (deficit) [2] 6,446,000 6,446,000      
Revision of Prior Period, Error Correction, Adjustment [Member] | Retained Earnings [Member]          
Total shareholders ’ equity (deficit) [2] $ (6,446,000) $ (6,446,000)      
[1] Refer to Note 2 for calculation of net loss attributable to common stockholders
[2] Represents noncash value of the effect of the down round feature on the Company’s Series AA Preferred stock, triggered in August 2023, and the related adjustments to additional paid in capital and accumulated deficit, with no impact to total equity, and a noncash adjustment to the computation of loss per share as reported in the Company’s 2023 Third Quarter 10-Q. The adjustments did not have any impact on total assets, total liabilities, total equity, revenues, cost of revenues, operating expense, net loss or cash flows as reported for the three and nine months ended September 30, 2023, as reported in the 2023 Third Quarter 10-Q.