CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities:
Net loss	$ (6,249)	$ (5,622)
Adjustments required to reconcile net loss to net cash used in operating activities:
Stock-based compensation	985	856
Amortization of premium or discount on marketable securities	(777)	0
Unrealized losses on cash equivalents	(1)	0
Changes in operating assets and liabilities:
Trade receivables, prepaid expenses and other assets and operating lease right-of-use assets	(1,294)	(200)
Trade payables, accrued expenses, employee related obligations and other long-term liabilities	(612)	(512)
Operating lease liabilities	(34)	0
Net cash used in operating activities	(7,982)	(5,478)
Cash Flows From Investing Activities:
Proceeds from the sale of the MST Franchise	0	5,000
Proceeds from sale and maturity of marketable securities	11,600	0
Purchases of marketable securities	(15,169)	0
Net cash (used in) provided by investing activities	(3,569)	5,000
Cash Flows From Financing Activities:
Proceeds related to issuance of common stock through at-the-market offerings, net of issuance costs	0	156
Redemption of convertible preferred stock	0	(360)
Withholdings from exercise of options and issuance of shares for stock-based compensation arrangements, net	(4)	(13)
Net cash used in financing activities	(4)	(217)
Decrease in cash, cash equivalents and restricted cash	(11,555)	(695)
Cash, cash equivalents and restricted cash at beginning of the period	30,674	30,975
Cash, cash equivalents and restricted cash at end of the period	19,119	30,280
Cash and cash equivalents	19,065	30,213
Restricted cash	54	67
Total cash, cash equivalents and restricted cash	19,119	30,280
Supplementary information on investing and financing activities not involving cash flows:
Accretion of preferred stock	$ 0	$ 149