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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