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v3.21.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ (52,412) | $ (75,305)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 31,960 | 4,456
Depreciation expense | 3,549 | 2,845
Net amortization of premiums and discounts on investments | (416) | (2,495)
Loss on sale of equipment |  | 56
Changes in assets and liabilities: |  |
Prepaid expenses and other current assets | (4,665) | (2,123)
Lease assets and liabilities, net | 571 | 1,233
Accounts payable | (410) | 3,000
Accrued expenses and other liabilities | 2,010 | 2,200
Accounts receivable | (75,000) |
Contract asset | (7,654) |
Other assets | (22) |
Net cash used in operating activities | (102,489) | (66,133)
Cash flows from investing activities: |  |
Purchases of property and equipment | (1,931) | (8,002)
Proceeds from sale of equipment |  | 20
Purchases of investments | (266,455) | (553,517)
Proceeds from maturities of investments | 350,058 | 242,475
Net cash provided by (used in) investing activities | 81,672 | (319,024)
Cash flows from financing activities: |  |
Proceeds from issuance of convertible preferred stock, net of issuance costs |  | 4,993
Proceeds from issuance of common stock upon exercise of stock options | 1,216 | 613
Proceeds from issuance of common stock upon initial public offering | 427,800 |
Offering costs paid | (2,507) |
Net cash provided by financing activities | 426,509 | 5,606
Net increase (decrease) in cash, cash equivalents and restricted cash | 405,692 | (379,551)
Cash, cash equivalents and restricted cash at beginning of period | 42,832 | 422,383
Cash, cash equivalents and restricted cash at end of period | 448,524 | 42,832
Supplemental disclosure of non-cash investing and financing activities: |  |
Property and equipment additions included in accounts payable and accrued expenses | 519 | 745
Reclassification of restricted stock liability to additional paid-in capital | 153 | 400
Extinguishment upon modification of Series C preferred stock | (177,789) |
Conversion of preferred stock into common stock upon initial public offering | 715,508 |
Right of use asset obtained in exchange for lease obligation | $ 819 | $ 24,936

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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