Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Cash flows from operating activities:
Net loss	$ (24,328)	$ (37,932)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	6,748	6,354
Amortization (accretion) of premium (discount) on marketable debt securities, net	(70)	(205)
Stock-based compensation	26,130	26,036
Deferred income taxes	6	119
Other non-cash items, net	(239)	478
Changes in operating assets and liabilities:
Accounts receivable	(468)	(3,349)
Inventories	(4,861)	928
Prepaid expenses and other current assets	(113)	(702)
Other non-current assets	11	(13)
Accounts payable	15,368	(12,037)
Accrued and other current liabilities	(692)	5,806
Income taxes payable	250	(637)
Deferred revenue	(1,984)	1,115
Operating lease liabilities	(971)	(983)
Other long-term liabilities	14	71
Net cash provided by (used in) operating activities	14,801	(14,951)
Cash flows from investing activities:
Purchase of investments	(21,048)	(6,653)
Sales of investments	1,428	7,195
Maturities of investments	8,031	2,725
Purchase of tangible and intangible assets	(4,565)	(1,132)
Net cash provided by (used in) investing activities	(16,154)	2,135
Cash flows from financing activities:
Stock repurchase	(1,000)	0
Proceeds from exercise of stock options and employee stock purchase plan	2,627	2,903
Long-term financing payment for intangible assets	(3,177)	(3,191)
Net cash used in financing activities	(1,550)	(288)
Net decrease in cash, cash equivalents and restricted cash	(2,903)	(13,104)
Cash, cash equivalents and restricted cash at beginning of period	144,629	144,921
Cash, cash equivalents and restricted cash at end of period	141,726	131,817
Supplemental disclosure of cash flow information:
Cash paid for income taxes	294	1,084
Supplemental disclosure of noncash investing activities:
Unpaid liabilities related to tangible and intangible assets purchases	$ 3,519	$ 298