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v3.21.1

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating activities |  |
Net loss | $ (63,853) | $ (35,372)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 2,549 | 1,826
Premium amortization and discount accretion on investment securities | 2,097 | 721
Stock-based compensation | 23,232 | 7,417
Non-cash lease expense | 2,671 | 1,940
Amortization of debt discount and issuance cost | 304 | 121
Inventory reserve adjustments | 316 | (64)
Other non-cash benefits (charges) | 56 | (57)
Provision for credit losses |  | 1,387
Changes in operating assets and liabilities |  |
Accounts receivable | (8,997) | (8,786)
Inventory | (3,966) | (1,703)
Prepaid expenses and other current assets | (31) | (3,227)
Other assets |  | 99
Accounts payable | (3,310) | 217
Accrued compensation | (4,501) | (135)
Other accrued liabilities | 18,602 | 3,348
Deferred revenue | (40,045) | (2,832)
Net cash used in operating activities | (74,876) | (35,100)
Investing activities |  |
Purchases of investments | (43,024) | (53,876)
Proceeds from sale of investments |  | 11,500
Proceeds from maturity of investments | 140,024 | 93,785
Purchases of property and equipment, net | (10,260) | (7,917)
Net cash provided by investing activities | 86,740 | 43,492
Financing activities |  |
Proceeds from exercise of stock options | 4,570 | 3,826
Net cash provided by financing activities | 4,570 | 3,826
Net increase in cash, cash equivalents and restricted cash | 16,434 | 12,218
Cash, cash equivalents and restricted cash, beginning of period | 48,855 | 61,981
Cash, cash equivalents and restricted cash, end of period | 65,289 | 74,199
Supplemental disclosure of cash flow information: |  |
Cash paid for interest | 152 | 2,343
Non-cash investing and financing activities: |  |
Purchases of property and equipment in accounts payable and accruals | $ 1,898 | $ 2,657

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