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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash Flows from Operating Activities:    
Net loss $ (8,795) $ (874)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 230 165
Loss on the sale of fixed assets 74  
Non-cash stock compensation expense 733 492
Non-cash lease expense 57 50
Non-cash interest expense 26 22
Change in fair value of warrant liability (724) (8,287)
Accretion of debt discount 75 32
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (730) 979
Accounts payable 149 (579)
Accrued expenses (1,790) 90
Deferred revenue (12) (31)
Lease liability (112) (112)
Net cash used in operating activities (10,819) (8,053)
Cash Flows from Investing Activities:    
Purchase of fixed assets (138) (171)
Proceeds from the sale of fixed assets 157  
Net cash provided by (used in) investing activities 19 (171)
Cash Flows from Financing Activities:    
Net proceeds from bank term loan   19,910
Proceeds from option exercises   6
Net cash provided by financing activities   19,916
Net increase (decrease) in cash (10,800) 11,692
Cash, cash equivalents and restricted cash at beginning of period 70,324 83,066
Cash, cash equivalents and restricted cash at end of period 59,524 94,758
Supplemental cash flow information:    
Cash paid for taxes   85
Cash paid for interest 500 117
Supplemental disclosures of non-cash information:    
Lease liability arising from obtaining right-of-use assets   2,368
Capital expenditures in accounts payable and accrued expenses $ 66 $ 421