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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income $ 572 $ 10,845
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation, amortization and other 1,122 1,928
Stock-based compensation expense 1,086 2,310
Amortization of debt discount and accretion related to debt   234
Accretion of asset retirement obligations 29 27
Change in valuation of contingent value right (544)  
Changes in operating assets and liabilities:    
Prepaid expenses 995 1,450
Grants revenue receivable (162) (2,838)
Other assets 551 (1,258)
Operating lease right-of-use assets and liabilities (79) (12)
Accounts payable 1,158 2,201
Accrued liabilities (1,531) (3,281)
Other liabilities 590  
Deferred revenue (9,031) (30,967)
Net cash used in operating activities (5,244) (19,361)
Cash flows from investing activities:    
Purchases of property and equipment   (183)
Purchase of marketable securities   (2,364)
Sales of marketable securities   28,500
Net cash provided by investing activities   25,953
Net (decrease)/increase in cash, cash equivalents, and restricted cash (5,244) 6,592
Cash, cash equivalents and restricted cash, beginning of period 12,838 34,679
Cash, cash equivalents and restricted cash, end of period 7,594 41,271
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 6,779 38,782
Restricted cash included in other assets $ 815 $ 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 $ 7,594 $ 41,271
Supplemental Cash Flow Information    
Cash paid for interest   1,111
Non-Cash Investing Activities    
Fixed asset additions in accounts payable and accrued expenses $ 0 $ 13

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