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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES      
Net loss $ (80,893) $ (78,254) $ (44,348)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 996 418 293
Purchase net (premium) discount on marketable securities (286) 504 907
Net amortization of premium (accretion of discount) on marketable securities 73 (818) (593)
Stock-based compensation 6,256 4,876 4,280
Research and development services settled with stock     107
Non-cash operating lease expense 628 483  
Other (9) (5) (40)
Changes in operating assets and liabilities:      
Accounts receivable - grant     3,078
Prepaid expenses and other assets (1,101) (346) (261)
Accounts payable (544) 2,583 239
Deferred revenue     (20)
Operating lease liabilities 251 (258)  
Accrued and other liabilities (1,146) 5,125 4,165
Net cash used in operating activities (75,775) (65,692) (32,193)
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchases of property and equipment (4,280) (1,492) (422)
Purchases of marketable securities (129,000) (91,926) (62,179)
Proceeds from maturities and sales of marketable securities 125,676 91,679 47,370
Net cash used in investing activities (7,604) (1,739) (15,231)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from issuance of common stock and pre-funded warrants in public and at-the-market offerings, net of offering costs 153,716 64,298 54,048
Proceeds from employee stock plan purchases and stock option exercises 816 1,450 3,020
Principal payments on finance lease obligation (20) (25)  
Net cash provided by financing activities 154,512 65,723 57,068
Effect of exchange rate on cash, cash equivalents, and restricted cash 51    
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 71,184 (1,708) 9,644
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH      
Beginning of period 20,753 22,461 12,817
End of period 91,937 20,753 22,461
Supplemental Disclosure of Non-Cash Investing and Financing Information:      
Leased assets obtained in exchange for lease obligations 172 5,294  
Unpaid amounts related to purchase of property and equipment $ 224 $ 356 $ 92