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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Cash flows from operating activities:    
Net loss $ (67,100) $ (34,472)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 11,945 9,295
Amortization (accretion) of premium (discount) on marketable debt securities, net (710) 0
Stock-based compensation 55,387 53,950
Deferred income taxes (2,908) 1,181
Other non-cash items, net 1,036 42
Changes in operating assets and liabilities:    
Accounts receivable 21,829 6,609
Inventories 5,716 5,116
Prepaid expenses and other current assets 66 (753)
Other non-current assets 57 765
Accounts payable (6,878) (11,873)
Accrued and other current liabilities 124 4,380
Income taxes payable (1,654) 1,865
Deferred revenue 325 (957)
Operating lease liabilities (1,993) (2,159)
Other long-term liabilities (55) 14
Net cash provided by operating activities 15,187 33,003
Cash flows from investing activities:    
Purchase of investments (34,178) (2,972)
Sales of investments 2,593 0
Maturities of investments 31,310 0
Purchase of tangible and intangible assets (7,694) (8,088)
Escrow claim associated with business acquisition 0 749
Net cash used in investing activities (7,969) (10,311)
Cash flows from financing activities:    
Proceeds from exercise of stock options and employee stock purchase plan 5,179 4,087
Payment for intangible assets (3,423) (2,878)
Net cash provided by financing activities 1,756 1,209
Net increase in cash, cash equivalents and restricted cash 8,974 23,901
Cash, cash equivalents and restricted cash at beginning of period 113,549 171,053
Cash, cash equivalents and restricted cash at end of period 122,523 194,954
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 2,975 661
Supplemental disclosure of noncash investing activities:    
Unpaid liabilities related to tangible and intangible assets purchases $ 8,188 $ 3,647