v3.22.2
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities    
Net loss $ (69,639) $ (162,128)
Adjustments to reconcile net loss to net cash used in operating activities:    
Gain on sale of ATOM Facility (50,237) 0
Stock-based compensation expense 28,452 26,075
Depreciation and amortization expense 3,029 4,540
Amortization of investment premiums 811 851
Non-cash operating lease expense 3,355 755
Asset retirement obligation accretion expense 46 43
Changes in operating assets and liabilities:    
Accounts receivable 349 1,250
Prepaid expenses and other current assets (1,546) 2,419
Other assets 76 18
Accounts payable (3,384) 4,356
Accrued compensation (8,833) (5,135)
Accrued research and development expenses 1,674 (2,942)
Other current liabilities 2,891 1,522
Deferred revenue (51,468) 2,188
Operating lease liabilities (4,211) (837)
Other long-term liabilities 142 (250)
Net cash used in operating activities (148,493) (127,275)
Investing activities    
Purchases of short-term investments (165,090) (158,869)
Proceeds from maturities and sales of short-term investments 166,390 208,515
Purchases of property and equipment (4,024) (4,258)
Net proceeds from sale of ATOM Facility 94,765 0
Net cash provided by (used in) investing activities 92,041 45,388
Financing activities    
Proceeds from issuance of common stock through ATM facilities, net 20,516 2,382
Proceeds from employee stock awards 1,405 4,348
Taxes paid related to net share settlement of restricted stock units (619) (1,244)
Principal payments on finance lease obligations (190) (130)
Other financing activities, net (104) (17)
Net cash provided by financing activities 21,008 5,339
Decrease in cash, cash equivalents and restricted cash (35,444) (76,548)
Cash, cash equivalents and restricted cash at beginning of period 107,478 201,798
Cash, cash equivalents and restricted cash at end of period 72,034 125,250
Non-cash investing and financing activities    
Property and equipment purchases included in accounts payable and other accrued liabilities 132 1,000
Operating lease assets obtained in exchange for lease obligations 4,795 0
Supplemental cash flow disclosure    
Cash paid for interest 133 18
Cash paid for income taxes $ 19 $ 7

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