UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net loss	$ (4,054)	$ (3,903)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	312	79
Stock-based compensation	427	204
Noncash lease costs	75	61
Amortization of debt issuance costs	37	0
Changes in operating assets and liabilities:
Accounts receivable	(140)	(73)
Prepaid expenses and other assets	(293)	(414)
Accounts payable and accrued expenses	388	489
Deferred revenue	(223)	(31)
Net cash used in operating activities	(3,471)	(3,588)
Investing Activities:
Purchases of property and equipment	(160)	(195)
Net cash used in investing activities	(160)	(195)
Financing Activities:
Proceeds from notes payable	5,000	0
Payment on notes payable issuance costs	(394)	0
Proceeds from public stock offering net of fees	949	0
Proceeds from stock options exercised	62	161
Reduction of finance lease liability	(7)	(10)
Net cash provided by financing activities	5,610	151
Net increase (decrease) in cash and cash equivalents	1,979	(3,632)
Cash and cash equivalents at beginning of period	4,100	16,704
Cash and cash equivalents at end of period	6,079	13,072
SUPPLEMENTAL DISCLOSURE OF CASH FLOW ACTIVITIES:
Cash paid for interest	1	0
SUPPLEMENTAL DISCLOSURE OF NON-CASH FINANCING ACTIVITIES:
Assets acquired under a ROU operating lease	$ 0	$ 31