CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities:
Net loss	$ (28,452)	$ (23,210)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation	0	72
Stock-based compensation	3,305	4,297
Loss from sale and disposal of fixed assets	0	282
Gain on the sale of the MST Franchise	0	(12,918)
Amortization of premium or discount on marketable securities	(255)	0
Unrealized gains on cash equivalents	1	0
Changes in operating assets and liabilities:
Decrease in inventory	0	97
Decrease in trade receivables, prepaid and other current assets and operating lease right of use asset	405	11,210
Decrease in trade payables, accrued expenses, employee related obligations, liability for employee severance benefits and other long-term liabilities	(559)	(8,681)
Increase (decrease) in operating lease liabilities	214	(349)
Net cash used in operating activities	(25,341)	(29,200)
Cash Flows From Investing Activities:
Proceeds from the sale of the MST Franchise	5,000	15,667
Purchases of marketable securities	(62,354)	0
Net cash (used in) provided by investing activities	(57,354)	15,667
Cash Flows From Financing Activities:
(Redemption) proceeds of convertible preferred stock	(360)
(Redemption) proceeds of convertible preferred stock		211
Withholdings from exercise of options and issuance of shares for stock-based compensation arrangements, net	(67)	(28)
Net cash provided by financing activities	82,394	1,653
Decrease in cash, cash equivalents and restricted cash	(301)	(11,880)
Cash, cash equivalents and restricted cash at beginning of the year	30,975	42,855
Cash, cash equivalents and restricted cash at end of the year	30,674	30,975
Cash and cash equivalents	30,620	30,908
Restricted cash	54	67
Total cash, cash equivalents and restricted cash	30,674	30,975
Supplementary information on investing and financing activities not involving cash flows:
Accretion of preferred stock	149	0
Issuance of shares under employee share purchase plan	48	37
Cashless exercise of warrants	132	0
Amount due from sale of MST Franchise	0	5,000
Additions to operating lease right of use assets	207	0
Additions to operating lease liabilities	214	0
Supplemental disclosure of cash flow information:
Interest received	1,139	446
Private Placement
Cash Flows From Financing Activities:
Proceeds related to the issuance of common shares and pre-funded warrants through private placement, net of issuance costs	82,665	0
At-the-market Offering
Cash Flows From Financing Activities:
Proceeds related to the issuance of common shares through at-the-market offerings, net of issuance costs	$ 156	$ 1,470