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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash Flows From Operating Activities:    
Net loss $ (22,264) $ (13,265)
Adjustments required to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 0 227
Changes in accrued liability for employee severance benefits, net of retirement fund profit 0 2
Stock-based compensation 2,595 3,230
Gain on the sale of the MST Franchise 0 (12,918)
Changes in operating assets and liabilities:    
(Increase) decrease in trade receivables (77) 8,048
Decrease in inventory 0 97
Decrease in prepaid expenses and other assets 1,094 1,741
Decrease in trade payables, accrued expenses, employee related obligations, liability for employee severance benefits and other long term liabilities (1,552) (11,202)
Decrease in operating lease liabilities 0 (349)
Net cash used in operating activities (20,204) (24,389)
Cash Flows From Investing Activities:    
Net proceeds from the sale of the MST Franchise 5,000 15,666
Net cash provided by investing activities 5,000 15,666
Cash Flows From Financing Activities:    
Proceeds related to issuance of common stock through offerings, net of issuance costs 156 1,471
Redemption of convertible preferred stock (360) 0
Withholdings related to issuance of stock for stock-based compensation arrangements, net (65) (26)
Net cash (used in) provided by financing activities (269) 1,445
Decrease in cash, cash equivalents and restricted cash (15,473) (7,278)
Cash, cash equivalents and restricted cash at beginning of the period 30,975 42,855
Cash, cash equivalents and restricted cash at end of the period 15,502 35,577
Cash and cash equivalents 15,448 35,510
Restricted cash 54 67
Total cash, cash equivalents and restricted cash shown in statement of cash flows 15,502 35,577
Supplementary information on investing and financing activities not involving cash flows:    
Issuance of vested shares under employee stock purchase plan 29 23
Amount due from sale of MST Franchise 0 5,000
Accretion of preferred stock $ 149 $ 0