Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows

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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:        
Net loss $ 4,153 $ 24,638 $ 4,176 $ 70,669
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation, amortization and other     5,447 5,564
Stock-based compensation expense     5,342 9,305
Interest accrued (paid) on long-term debt     (376) 64
Amortization of debt discount and accretion related to debt     393 747
Gain on extinguishment of debt     (1,795)  
Accretion of asset retirement obligations     82 98
Loss on disposal of property and equipment [1] 76 28 475 29
Change in valuation of contingent value right (881)   (1,184)  
Changes in operating assets and liabilities:        
Prepaid expenses     460 188
Other assets     58 (724)
Operating lease right-of-use assets and liabilities     (136) (572)
Accounts payable     2,079 (572)
Accrued liabilities     (4,935) (694)
Deferred revenue     (38,267) (13,356)
Net cash used in operating activities     (36,533) (70,592)
Cash flows from investing activities:        
Purchases of property and equipment     (200) (2,886)
Proceeds from sale of equipment     260  
Purchase of marketable securities     (2,364) (52,132)
Sales of marketable securities     31,400 121,990
Net cash provided by investing activities     29,096 66,972
Cash flows from financing activities:        
Proceeds from issuance of common stock and prefunded warrants, net offering expenses     18,383  
Proceeds from stock option exercises     1 33
Repayment of long-term debt     (27,500)  
Fees paid on loan modification     0 (298)
Net cash used in financing activities     (9,116) (265)
Net decrease in cash, cash equivalents, and restricted cash     (16,553) (3,885)
Cash, cash equivalents and restricted cash, beginning of period     34,679 28,651
Cash, cash equivalents and restricted cash, end of period 18,126 24,766 18,126 24,766
Reconciliation of cash, cash equivalents and restricted cash        
Cash and cash equivalents 15,811 22,277 15,811 22,277
Restricted cash included in other assets $ 2,315 $ 2,489 $ 2,315 $ 2,489
Restricted Cash and Cash Equivalents, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other assets Other assets Other assets Other assets
Total cash, cash equivalents and restricted cash $ 18,126 $ 24,766 $ 18,126 $ 24,766
Supplemental Cash Flow Information        
Cash paid for interest     2,293 2,471
Non-Cash Investing Activities        
Fixed asset additions in accounts payable and accrued expenses     $ 0 $ 50
[1] Loss on disposal of property and equipment was included in interest and other expense, net in the prior year presentation.