v3.24.1
Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ 8,124 $ 92,718
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and other 6,645 7,383
Loss on disposal of property and equipment 475 66
Change in valuation of contingent value right (2,457)  
Stock-based compensation expense 6,702 11,909
Amortization of debt discount and accretion related to debt 393 975
Impairment of fixed assets and intangibles   430
Gain on extinguishment of debt (1,795)  
Accretion of asset retirement obligations 111 124
Changes in operating assets and liabilities:    
Prepaid expenses 1,264 458
Grants revenue receivable (250)  
Other assets 1,190 (438)
Operating lease right-of-use assets and liabilities (212) (550)
Accounts payable 1,019 (1,108)
Accrued liabilities (4,335) (745)
Deferred revenue (42,446) (14,810)
Net cash used in operating activities (41,820) (89,024)
Cash flows from investing activities:    
Purchases of property and equipment (200) (3,198)
Proceeds from sale of equipment 260  
Purchase of marketable securities (2,365) (55,525)
Sales of marketable securities 31,400 154,040
Net cash provided by investing activities 29,095 95,317
Cash flows from financing activities:    
Proceeds from issuance of common stock and prefunded warrants, net offering expenses 18,383  
Repayment of long-term debt (27,500)  
Proceeds from stock option exercises 1 33
Fees paid on loan modification   (298)
Net cash used in financing activities (9,116) (265)
Net (decrease)/increase in cash, cash equivalents, and restricted cash (21,841) 6,028
Cash, cash equivalents and restricted cash, beginning of period 34,679 28,651
Cash, cash equivalents and restricted cash, end of period 12,838 34,679
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 11,523 32,190
Restricted cash included in Other assets $ 1,315 $ 2,489
Restricted Cash and Cash Equivalents, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Total cash, cash equivalents and restricted cash $ 12,838 $ 34,679
Supplemental Cash Flow Information    
Cash paid for interest $ 2,293 3,495
Non-cash right-of-use asset obtained in exchange for operating lease obligation   4,517
Non-Cash Investing and Financing Activities    
Fixed asset additions in accounts payable and accrued expenses   $ 53

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