Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Cash Flows

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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (22,942) $ (20,997)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 385 337
Loss on disposal of equipment 1 2
Stock-based compensation expense 4,948 5,228
Amortization of operating lease right-of-use assets 548 542
Amortization of finance lease right-of-use assets 8 19
Amortization of bond discount 107 211
Stock issued pursuant to license agreement amendment 291
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 3,983 (4,197)
Accounts payable (103) (321)
Accrued expenses and other liabilities (1,651) 249
Operating lease liabilities (562) (520)
Net cash used in operating activities (15,278) (19,156)
Cash flows from investing activities:    
Purchases of marketable debt securities (9,481)
Proceeds from sales of marketable debt securities 13,460 15,250
Purchases of leasehold improvements and equipment (218) (892)
Net cash provided by investing activities 13,242 4,877
Cash flows from financing activities:    
Proceeds from exercise of options 99
Payments of capital lease liability – principal (7) (20)
Net cash (used in) provided by financing activities (7) 79
Net decrease in cash, cash equivalents and restricted cash (2,043) (14,200)
Cash, cash equivalents and restricted cash at beginning of period 7,080 21,280
Cash, cash equivalents and restricted cash at end of period 5,037 7,080
Supplemental non-cash financing and investing activities:    
Unrealized gain/(loss) on marketable debt securities 603 (679)
Cash exercise of warrants in prepaid expenses and other current assets (201)
Right-of-use asset in exchange from liabilities from an operating lease modification (64)
Right-of-use asset in exchange from liabilities from finance leases $ 14