v3.20.4
Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ 104,916 $ 69,421
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and other 3,917 1,182
Impairment and loss on fixed assets and intangibles 2,170 22,139
Stock-based compensation expense 11,817 5,859
Interest due on long-term debt 109 0
Amortization of debt discount and accretion related to debt 448 486
Change in common stock warrant fair value 0 (3)
Accretion of asset retirement obligations 125 72
Loss on extinguishment of debt 1,237 0
Changes in operating assets and liabilities:    
Prepaid expenses (3,762) (74)
Accounts receivable, related party 174 (168)
Grants revenue receivable 7,100 (2,771)
Other assets 1,948 (286)
Operating lease right-of-use assets and liabilities (87) 2,816
Accounts payable 499 652
Accrued liabilities (2,672) 6,534
Other liabilities, related party 12,325 (36)
Deferred revenue (8,903) 27,455
Deferred revenue, related party (5,326) (19,680)
Net cash used in operating activities (83,797) (25,244)
Cash flows from investing activities:    
Purchases of property and equipment (7,392) (9,649)
Proceeds on sale of equipment 15 0
Purchase of marketable securities (132,809) (90,159)
Sales of marketable securities 105,523 60,084
Net cash used in investing activities (34,663) (39,724)
Cash flows from financing activities:    
Proceeds from issuance of common stock through Private Placement, net of issuance costs 0 10,469
Proceeds from issuance of common stock, net of issuance costs 48,372 53,449
Payments of capital and finance lease obligations (18) 32
Proceeds from issuance of long-term debt and warrants, net 14,677 0
Repayment of long-term debt (5,176) 0
Proceeds from stock option exercises 1,040 1,748
Net cash provided by financing activities 58,895 65,698
Net increase/(decrease) in cash, cash equivalents, and restricted cash (59,565) 730
Cash, cash equivalents and restricted cash, beginning of period 88,451 87,721
Cash, cash equivalents and restricted cash, end of period 28,886 88,451
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 25,218 85,451
Restricted cash included in Other assets $ 3,668 $ 3,000
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsMember us-gaap:OtherAssetsMember
Cash, cash equivalents and restricted cash, end of period $ 28,886 $ 88,451
Supplemental Cash Flow Information    
Cash paid for interest 931 684
Non-Cash Investing and Financing Activities    
Fixed asset additions in accounts payable and accrued expenses $ 980 $ 2,686

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