v3.21.2
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ 72,766 $ 76,471
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and other 4,828 2,526
Stock-based compensation expense 12,822 8,527
Interest accrued on long-term debt 137 106
Amortization of debt discount and accretion related to debt 497 344
Accretion of asset retirement obligations 100 93
Loss on extinguishment of debt 0 1,237
Loss on disposal of property and equipment 356 0
Changes in operating assets and liabilities:    
Prepaid expenses (1,543) (2,571)
Accounts receivable, related party 234 107
Grants revenue receivable 0 3,610
Other assets 818 301
Operating lease right-of-use assets and liabilities 504 (129)
Accounts payable (1,048) 644
Accrued liabilities (1,635) (1,930)
Other liabilities (472) 0
Other liabilities, related party (11,853) 12,209
Deferred revenue 64,990 (7,174)
Deferred revenue, related party (3,895) (3,720)
Net cash used in operating activities (7,926) (62,291)
Cash flows from investing activities:    
Purchases of property and equipment (3,113) (4,512)
Proceeds of sale of equipment 0 15
Purchase of marketable securities (184,490) (115,895)
Sales of marketable securities 105,350 72,523
Net cash used in investing activities (82,253) (47,869)
Cash flows from financing activities:    
Payments of capital and finance lease obligations (1) (16)
Proceeds from issuance of long-term debt and warrants, net 19,828 14,677
Repayment of long-term debt 0 (5,176)
Proceeds from stock option exercises 1,582 930
Proceeds from issuance of common stock and warrants, net offering expenses 71,145 48,372
Net cash provided by financing activities 92,554 58,787
Net increase/(decrease) in cash, cash equivalents, and restricted cash 2,375 (51,373)
Cash, cash equivalents and restricted cash, beginning of period 28,886 88,451
Cash, cash equivalents and restricted cash, end of period 31,261 37,078
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 27,593 33,410
Restricted cash included in other assets $ 3,668 $ 3,668
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Cash, cash equivalents and restricted cash, end of period $ 31,261 $ 37,078
Supplemental Cash Flow Information    
Cash paid for interest 1,481 611
Non-Cash Investing and Financing Activities    
Fixed asset additions in accounts payable and accrued expenses $ 237 $ 967

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