v3.22.2
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ 46,031 $ 42,379
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and other 3,748 3,135
Stock-based compensation expense 6,664 8,579
Interest accrued on long-term debt (24) 137
Amortization of debt discount and accretion related to debt 482 264
Accretion of asset retirement obligations 73 66
Loss on disposal of property and equipment 1 42
Changes in operating assets and liabilities:    
Prepaid expenses 1,522 (1,132)
Accounts receivable, related party 0 234
Other assets (892) 763
Operating lease right-of-use assets and liabilities (453) (46)
Accounts payable (247) (498)
Accrued liabilities (367) (3,902)
Other liabilities, related party 0 (11,853)
Deferred revenue (10,641) 64,783
Deferred revenue, related party 0 (1,309)
Net cash (used in)/provided by operating activities (46,165) 16,884
Cash flows from investing activities:    
Purchases of property and equipment (1,900) (1,790)
Purchase of marketable securities (39,097) (144,620)
Sales of marketable securities 88,389 55,700
Net cash (used in)/provided by investing activities 47,392 (90,710)
Cash flows from financing activities:    
Payments of capital and finance lease obligations 0 (1)
Proceeds from issuance of long-term debt 0 19,828
Proceeds from stock option exercises 24 726
Proceeds from issuance of common stock and warrants, net offering expenses 0 71,145
Fees paid on loan modification (298) 0
Net cash (used in)/provided by financing activities (274) 91,698
Net increase in cash, cash equivalents, and restricted cash 953 17,872
Cash, cash equivalents and restricted cash, beginning of period 28,651 28,886
Cash, cash equivalents and restricted cash, end of period 29,604 46,758
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 26,936 43,090
Restricted cash included in other assets $ 2,668 $ 3,668
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] us-gaap:OtherAssets us-gaap:OtherAssets
Total cash, cash equivalents and restricted cash $ 29,604 $ 46,758
Supplemental Cash Flow Information    
Cash paid for interest 1,556 725
Non-Cash Investing and Financing Activities    
Fixed asset additions in accounts payable and accrued expenses $ 443 $ 319

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