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v3.22.2

Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities: |  |
Net loss | $ (133.4) | $ (91.3)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 3.0 | 2.3
Net accretion of bond discounts/premiums | 5.8 | 2.7
Forgiveness of debt income | 0.0 | (1.0)
Loss on sale of marketable securities | 0.1 | 0.0
Amortization of right-of-use assets | 1.0 | 0.6
Amortization of collaboration contract asset | 0.8 | 0.0
Stock-based compensation | 36.6 | 24.9
Changes in operating assets and liabilities: |  |
Accounts receivable | 13.6 | 1.0
Other receivables | 4.0 | 0.0
Prepaid expenses and other current assets | (1.0) | (9.1)
Accounts payable and accrued liabilities | (12.7) | (7.8)
Operating lease liability | (1.0) | (0.6)
Deferred revenue | (52.5) | (8.1)
Net cash used in operating activities | (135.7) | (86.4)
Cash flows from investing activities: |  |
Purchases of marketable securities | (469.1) | (538.0)
Maturities of marketable securities | 555.9 | 82.6
Sales of marketable securities | 34.3 | 0.0
Purchases of property, equipment and leasehold improvements | (3.5) | (1.5)
Net cash provided by (used in) investing activities | 117.6 | (456.9)
Cash flows from financing activities: |  |
Proceeds from exercise of stock options | 3.0 | 8.1
Net cash provided by financing activities | 3.0 | 8.1
Net decrease in cash, cash equivalents and restricted cash | (15.1) | (535.2)
Cash, cash equivalents and restricted cash, beginning of the period | 112.8 | 588.4
Cash, cash equivalents and restricted cash, end of the period | 97.7 | 53.2
Supplemental disclosure of cash flow information: |  |
Purchases of property, equipment and leasehold improvements unpaid at period end | $ 0.5 | $ 0.3

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