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v3.21.2

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities |  |
Net loss | $ (91,207) | $ (91,609)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization expense | 5,510 | 6,105
Amortization of premiums and discounts on marketable securities | 808 | (401)
Stock-based compensation | 11,356 | 9,587
Changes in operating assets and liabilities: |  |
Accounts receivable | (22,166) | (6,461)
Inventory | (6,476) | 0
Prepaid expenses and other current assets | (974) | 3,093
Other assets | 4,404 | 995
Accounts payable | 1,668 | (1,476)
Accrued expenses and other current liabilities | 5,365 | 3,337
Lease liabilities | (1,673) | (1,534)
Deferred revenue | 18,659 | (3,767)
Other non current liabilities | 0 | 1,443
Net cash used in operating activities | (74,726) | (80,688)
Cash flows from investing activities |  |
Purchases of marketable securities | (117,546) | (72,199)
Proceeds from sale and maturities of marketable securities | 99,800 | 125,617
Purchases of property, equipment and software | (2,693) | (1,847)
Net cash provided by (used in) investing activities | (20,439) | 51,571
Cash flows from financing activities |  |
Proceeds from issuance of common stock, net of offering costs | 98,200 | 96,512
Proceeds from stock option exercises and ESPP purchases | 4,910 | 2,665
Net cash provided by financing activities | 103,004 | 99,177
Net change in cash and cash equivalents | 7,839 | 70,060
Cash and cash equivalents at beginning of period | 181,131 | 126,472
Cash and cash equivalents at end of period | 188,970 | 196,532
Supplemental Cash Flow Information [Abstract] |  |
Property, equipment and software included in accounts payable or accruals | 118 | 0
Retirement Of Treasury Stock | $ (106) | $ 0

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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 + Details
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