v3.22.2.2
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net loss $ 70,669 $ 72,766
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and other 5,564 4,828
Stock-based compensation expense 9,305 12,822
Interest accrued on long-term debt 64 137
Amortization of debt discount and accretion related to debt 747 497
Accretion of asset retirement obligations 98 100
Loss on disposal of property and equipment 29 356
Changes in operating assets and liabilities:    
Prepaid expenses 188 (1,543)
Accounts receivable, related party 0 234
Other assets (724) 818
Operating lease right-of-use assets and liabilities (572) 504
Accounts payable (572) (1,048)
Accrued liabilities (694) (1,635)
Other liabilities 0 (472)
Other liabilities, related party 0 (11,853)
Deferred revenue (13,356) 64,990
Deferred revenue, related party 0 (3,895)
Net cash used in operating activities (70,592) (7,926)
Cash flows from investing activities:    
Purchases of property and equipment (2,886) (3,113)
Purchase of marketable securities (52,132) (184,490)
Sales of marketable securities 121,990 105,350
Net cash (used in)/provided by investing activities 66,972 (82,253)
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 33 1,582
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 (265) 92,554
Net (decrease)/increase in cash, cash equivalents, and restricted cash (3,885) 2,375
Cash, cash equivalents and restricted cash, beginning of period 28,651 28,886
Cash, cash equivalents and restricted cash, end of period 24,766 31,261
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 22,277 27,593
Restricted cash included in other assets $ 2,489 $ 3,668
Restricted Cash and Cash Equivalents, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Total cash, cash equivalents and restricted cash $ 24,766 $ 31,261
Supplemental Cash Flow Information    
Cash paid for interest 2,471 1,481
Non-Cash Investing and Financing Activities    
Fixed asset additions in accounts payable and accrued expenses $ 50 $ 237

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