Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Cash flows from operating activities:
Net loss	$ (10,822)	$ (10,818)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,608	2,883
Amortization (accretion) of premium (discount) on marketable debt securities, net	0	417
Stock-based compensation	27,041	18,842
Deferred income taxes	1,370	433
Other non-cash items, net	32	(190)
Changes in operating assets and liabilities:
Accounts receivable	16,299	(9,554)
Inventories	3,696	(7,039)
Prepaid expenses and other current assets	(2,731)	161
Other non-current assets	435	(65)
Accounts payable	(2,865)	(480)
Accrued and other current liabilities	(2,515)	1,969
Income taxes payable	236	(262)
Deferred revenue	(450)	(74)
Operating lease liabilities	(1,069)	(856)
Other long-term liabilities	295	86
Net cash provided by (used in) operating activities	33,560	(4,547)
Cash flows from investing activities:
Purchase of investments	0	(57,117)
Escrow claim associated with business acquisition	749	0
Sales of investments	0	18,609
Maturities of investments	0	29,232
Purchase of tangible and intangible assets	(4,701)	(1,954)
Net cash used in investing activities	(3,952)	(11,230)
Cash flows from financing activities:
Proceeds from exercise of stock options and employee stock purchase plan	1,876	3,893
Payment for intangible assets	(1,888)	(1,881)
Net cash provided by (used in) financing activities	(12)	2,012
Net increase (decrease) in cash, cash equivalents and restricted cash	29,596	(13,765)
Cash, cash equivalents and restricted cash at beginning of period	171,053	241,284
Cash, cash equivalents and restricted cash at end of period	200,649	227,519
Supplemental disclosure of cash flow information:
Cash paid for income taxes	232	1,013
Supplemental disclosure of noncash investing and financing activities:
Unpaid liabilities related to tangible and intangible assets purchases	$ 1,549	$ 304