CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS UNAUDITED - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net loss	$ (7,463)	$ (6,774)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	145	128
Charge for 401(k) company common stock match	63	76
Stock-based compensation	830	1,011
Non-cash lease expense	110	192
Deferred income tax provision	0	19
Changes in operating assets and liabilities:
Accounts receivable	0	129
Unbilled receivables	30	6
Prepaid expenses and other assets	(48)	(37)
Accounts payable	331	(59)
Accrued expenses	436	(80)
Lease liabilities	(180)	(251)
Net cash used in operating activities	(5,746)	(5,640)
Cash flows from investing activities
Purchase of property and equipment	(27)	(133)
Purchase of investments	0	(710)
Proceeds from the maturity of short-term investments	1,991	4,371
Net cash provided by investing activities	1,964	3,528
Cash flows from financing activities
Proceeds from issuance of common stock and warrants in equity offering, net of issuance costs	2,717	0
Proceeds from At-the-Market offering, net of issuance costs	103	0
Proceeds for convertible debt note	1,000	0
Taxes paid on employees' behalf related to vesting of stock awards	(41)	(14)
Net cash provided by (used by) financing activities	3,779	(14)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(17)	(23)
Net decrease in cash, cash equivalents and restricted cash	(20)	(2,149)
Cash, cash equivalents and restricted cash at beginning of period	2,620	5,593
Cash, cash equivalents and restricted cash at end of period	2,600	3,444
Supplemental disclosure of non-cash information:
Right-of-use assets acquired in exchange for lease liabilities	$ 100	$ 0