v3.23.1
Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Loss $ (5,019) $ (4,086)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 20 20
Operating lease right of use asset amortization 52 50
Financing lease right of use asset amortization 291 319
Stock-based compensation 927 726
Net accretion of discounts on available-for-sale securities (3) 0
Changes in operating assets and liabilities:    
Accounts receivable 0 (300)
Prepaid expenses and other current assets 122 (537)
Accounts payable 26 42
Accrued expenses 69 38
Accrued payroll expenses (675) (341)
Operating lease liability (44) (42)
Net cash used in operating activities (4,234) (4,111)
CASH FLOWS FROM INVESTING ACTIVITIES    
Acquisition of property and equipment (15) (16)
Purchase of available-for-sale securities (4,942) 0
Net cash used in investing activities (4,957) (16)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from at-the-market sale of stock, net of commissions and expenses 274 0
Proceeds from exercise of stock options 39 166
Payments on principal of financing lease (188) (287)
Net cash provided (used) by financing activities 125 (121)
Net decrease in cash and cash equivalents (9,066) (4,248)
Cash and cash equivalents at beginning of period 21,184 28,699
Cash and cash equivalents at end of period 12,118 24,451
Supplemental information:    
Cash paid for interest 53 71
Cash paid for taxes $ 0 $ 0