Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows (Unaudited)

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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 income/(loss) $ 10,845 $ (21,611)
Adjustments to reconcile net income/(loss) to net cash used in operating activities:    
Depreciation, amortization and other 1,928 1,872
Stock-based compensation expense 2,310 3,682
Interest accrued on long-term debt 17 3
Amortization of debt discount and accretion related to debt 234 246
Accretion of asset retirement obligations 27 36
Loss on disposal of property and equipment 0 1
Changes in operating assets and liabilities:    
Prepaid expenses 1,450 1,302
Grants revenue receivable (2,838) 0
Other assets (1,258) (1,706)
Operating lease right-of-use assets and liabilities (12) (226)
Accounts payable 2,201 (1,612)
Accrued liabilities (3,298) (2,234)
Deferred revenue (30,967) (7,449)
Net cash used in operating activities (19,361) (27,696)
Cash flows from investing activities:    
Purchases of property and equipment (183) (553)
Purchase of marketable securities (2,364) (12,732)
Sales of marketable securities 28,500 34,570
Net cash provided by investing activities 25,953 21,285
Net increase/(decrease) in cash, cash equivalents, and restricted cash 6,592 (6,411)
Cash, cash equivalents and restricted cash, beginning of period 34,679 28,651
Cash, cash equivalents and restricted cash, end of period 41,271 22,240
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 38,782 19,572
Restricted cash included in other assets $ 2,489 $ 2,668
Restricted Cash and Cash Equivalents, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Total cash, cash equivalents and restricted cash $ 41,271 $ 22,240
Supplemental Cash Flow Information    
Cash paid for interest 1,111 753
Non-Cash Investing Activities    
Fixed asset additions in accounts payable and accrued expenses $ 13 $ 621