CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS UNAUDITED - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (11,189)	$ (10,263)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	217	197
Charge for 401(k) company common stock match	91	111
Stock-based compensation	1,209	1,458
Non-cash lease expense	192	291
Deferred income tax provision	0	37
Changes in operating assets and liabilities:
Accounts receivable	0	127
Unbilled receivables	30	(5)
Prepaid expenses and other assets	121	52
Accounts payable	272	21
Accrued expenses	1,002	17
Lease liabilities	(302)	(385)
Net cash used in operating activities	(8,357)	(8,342)
Cash flows from investing activities
Purchase of property and equipment	(26)	(154)
Purchase of investments	0	(1,195)
Proceeds from the maturity of short-term investments	1,991	8,371
Net cash provided by investing activities	1,965	7,022
Cash flows from financing activities
Proceeds from 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 for 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	(18)	(50)
Net increase (decrease) in cash, cash equivalents and restricted cash	461	(1,407)
Cash, cash equivalents and restricted cash at beginning of period	2,620	5,593
Cash, cash equivalents and restricted cash at end of period	3,081	4,186
Supplemental disclosure of non-cash information:
Right-of-use assets acquired in exchange for lease liabilities	$ 138	$ 0