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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities:    
Net loss $ (6,925) $ (5,822)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 43 32
Reduction in the carrying amount of right-of-use assets 159 144
Share-based compensation 595 623
Changes in operating assets and liabilities:    
Accounts receivable 86 (64)
Prepaid expenses and other current assets 70 136
Accounts payable 69 425
Accrued expenses and other current liabilities 353 (87)
Deferred revenue (8) (847)
Operating lease liability (153) (98)
Net cash used in operating activities (5,711) (5,558)
Investing activities:    
Purchase of property and equipment (12) (54)
Net cash used in investing activities (12) (54)
Financing activities:    
Proceeds from sales of common stock 2,950 1,519
Issuance costs of sale of common stock (285) (165)
Net cash provided by financing activities 2,665 1,354
Net change in cash and cash equivalents (3,058) (4,258)
Cash and cash equivalents at beginning of period 7,363 12,872
Cash and cash equivalents at end of period 4,305 8,614
Supplemental disclosure of noncash investing and financing activities:    
Unpaid issuance costs of common stock 106 67
Issuance of restricted stock units in lieu of cash bonus obligations $ 564 $ 401