v3.21.2
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ 42,379 $ 53,246
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and other 3,135 1,318
Stock-based compensation expense 8,579 5,242
Interest accrued on long-term debt 137 0
Amortization of debt discount and accretion related to debt 264 243
Accretion of asset retirement obligations 66 62
Loss on extinguishment of debt 0 1,237
Loss on disposal of property and equipment 42 0
Changes in operating assets and liabilities:    
Prepaid expenses (1,132) (1,029)
Accounts receivable, related party 234 (2,759)
Grants revenue receivable 0 1,200
Other assets 763 364
Operating lease right-of-use assets and liabilities (46) (122)
Accounts payable (498) 149
Accrued liabilities (3,902) (514)
Other liabilities, related party (11,853) 11,979
Deferred revenue 64,783 (4,443)
Deferred revenue, related party (1,309) (2,154)
Net cash provided by/(used in) operating activities 16,884 (42,473)
Cash flows from investing activities:    
Purchases of property and equipment (1,790) (3,429)
Purchase of marketable securities (144,620) (60,171)
Sales of marketable securities 55,700 38,323
Net cash used in investing activities (90,710) (25,277)
Cash flows from financing activities:    
Payments of capital and finance lease obligations (1) (13)
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 726 681
Proceeds from issuance of common stock and warrants, net offering expenses 71,145 0
Net cash provided by financing activities 91,698 10,169
Net increase/(decrease) in cash, cash equivalents, and restricted cash 17,872 (57,581)
Cash, cash equivalents and restricted cash, beginning of period 28,886 88,451
Cash, cash equivalents and restricted cash, end of period 46,758 30,870
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 43,090 27,645
Restricted cash included in other assets $ 3,668 $ 3,225
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List] Other Assets Other Assets
Cash, cash equivalents and restricted cash, end of period $ 46,758 $ 30,870
Supplemental Cash Flow Information    
Cash paid for interest 725 248
Non-Cash Investing and Financing Activities    
Fixed asset additions in accounts payable and accrued expenses $ 319 $ 145

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