Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Cash flows from operating activities:
Net loss	$ (65,386)	$ (26,411)	$ (59,786)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	19,934	14,007	11,967
Amortization (accretion) of premium (discount) on marketable debt securities, net	(683)	1,034	721
Stock-based compensation	111,158	87,801	70,134
Deferred income taxes	(3,936)	(4,426)	(514)
Other non-cash items, net	(751)	(509)	65
Changes in operating assets and liabilities:
Accounts receivable	(7,680)	(18,600)	(6,487)
Inventories	4,733	(18,944)	(3,110)
Prepaid expenses and other current assets	153	228	(537)
Other non-current assets	978	832	1,141
Accounts payable	(13,325)	9,822	6,214
Accrued and other current liabilities	5,225	(1,954)	12,055
Income taxes payable	2,867	83	272
Deferred revenue	1,012	(131)	144
Operating lease liabilities	(4,011)	(3,608)	(2,416)
Other long-term liabilities	(6,195)	(429)	937
Net cash provided by operating activities	44,093	38,795	30,800
Cash flows from investing activities:
Acquisition, net of cash acquired	0	(307,038)	0
Purchases of investments	(97,437)	(118,726)	(219,677)
Sales of investments	2,444	208,132	70,087
Maturities of investments	2,000	107,760	123,208
Purchase of tangible and intangible assets	(15,051)	(9,679)	(4,942)
Escrow claim associated with business acquisition	749	0	0
Net cash used in investing activities	(107,295)	(119,551)	(31,324)
Cash flows from financing activities:
Stock repurchase	0	0	(1,000)
Proceeds from exercise of stock options and employee stock purchase plan	10,585	15,292	16,417
Long-term financing payment for intangible assets	(4,887)	(4,767)	(5,021)
Net cash provided by financing activities	5,698	10,525	10,396
Net increase (decrease) in cash, cash equivalents and restricted cash	(57,504)	(70,231)	9,872
Cash, cash equivalents and restricted cash at beginning of period	171,053	241,284	231,412
Cash, cash equivalents and restricted cash at end of period	113,549	171,053	241,284
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,444	1,869	1,531
Supplemental disclosure of noncash investing activities:
Unpaid liabilities related to tangible and intangible assets purchases	$ 16,410	$ 1,569	$ 4,302