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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (6,039) $ (6,318)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 99 108
Stock-based compensation 353 369
Non-cash lease expense 82 (62)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 556 (153)
Accounts payable 27 (429)
Accrued compensation expenses 110 (243)
Accrued expenses 300 (238)
Net cash used in operating activities (4,512) (6,966)
Cash flows from investing activities:    
Purchases of property and equipment (182) (37)
Net cash used in investing activities (182) (37)
Cash flows from financing activities:    
Net proceeds from exercise of options 3
Issuance of common stock and warrants in connection with securities purchase agreement, net of issuance costs 13,687
Net cash provided by financing activities 13,690
Effect of exchange rate changes on cash and cash equivalents (2)
Cash, cash equivalents and restricted cash:    
Net increase (decrease) 8,994 (7,003)
Balance at beginning of period 21,992 46,442
Balance at end of period 30,986 39,439
Supplemental disclosure of cash flow information:    
Income taxes 2 1
Non-cash investing and financing activities:    
Establishment of operating right-of-use assets through operating lease obligations 668
Receivables for cash in-transit on exercise of common stock under equity incentive plan (3)
Purchases of property and equipment in accounts payable and accrued expenses $ (123)

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