CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net loss	$ (14,455)	$ (13,566)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	290	263
Expense for 401(k) company common stock match	108	133
Stock-based compensation	1,592	1,903
Noncash lease expense	308	393
Deferred tax asset	0	165
Changes in operating assets and liabilities:
Accounts receivable	0	164
Unbilled receivables	30	4
Prepaid expenses and other assets	345	(160)
Accounts payable	1,093	26
Accrued expenses	1,077	(209)
Lease liabilities	(456)	(520)
Net cash used in operating activities	(10,068)	(11,404)
Cash flows from investing activities
Purchase of property and equipment	(46)	(154)
Purchase of investments	0	(2,445)
Proceeds from sale and maturity of short-term investments	1,991	11,121
Net cash provided by investing activities	1,945	8,522
Cash flows from financing activities
Proceeds from the issuance of common stock and warrants in equity offerings, net of issuance costs	5,842	0
Proceeds from At-the-Market offering, net of issuance costs	103	0
Proceeds from issuance of convertible debt note, net of issuance costs	967	0
Taxes paid on employees' behalf related to vesting of stock awards	(41)	(37)
Net cash provided by (used in) financing activities	6,871	(37)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(36)	(54)
Net decrease in cash, cash equivalents and restricted cash	(1,288)	(2,973)
Cash, cash equivalents and restricted cash at beginning of year	2,620	5,593
Cash, cash equivalents and restricted cash at end of year	1,332	2,620
Supplemental Cash Flow Disclosure:
Interest paid	68	10
Right-of-use assets acquired in exchange for lease liabilities	$ 138	$ 0