Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Outstanding Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Beginning Balance, Amount at Jan. 31, 2019	$ 419,489	$ 15	$ 188,516	$ 97	$ 230,861
Beginning Balance, Shares at Jan. 31, 2019		32,303,540
Exercise of stock options, Amount	$ 5,695	$ 0	5,695	0	0
Exercise of stock options, Shares	366,886	366,886
Vesting of restricted stock units, Amount	$ 0	$ 0	0	0	0
Vesting of restricted stock units, Shares		957,319
Employee stock purchase plan, Amount	5,967	$ 0	5,967	0	0
Employee stock purchase plan, Shares		177,864
Stock-based compensation expense related to stock awards granted to employees and consultants	61,042	$ 0	61,042	0	0
Other comprehensive income (loss) - net of tax	671	0	0	671	0
Net loss	(44,792)	0	0	0	(44,792)
Ending Balance, Amount at Jan. 31, 2020	448,072	$ 15	261,220	768	186,069
Ending Balance, Shares at Jan. 31, 2020		33,805,609
Exercise of stock options, Amount	$ 10,333	$ 0	10,333	0	0
Exercise of stock options, Shares	421,736	421,736
Vesting of restricted stock units, Amount	$ 5,351	$ 1	5,350	0	0
Vesting of restricted stock units, Shares		1,162,883
Employee stock purchase plan, Amount	5,825	$ 0	5,825	0	0
Employee stock purchase plan, Shares		182,931
Stock repurchase, Amount	(1,000)	$ 0	(1,000)	0	0
Stock repurchase, Shares		(25,719)
Stock-based compensation expense related to stock awards granted to employees and consultants	65,730	$ 0	65,730	0	0
Other comprehensive income (loss) - net of tax	451	0	0	451	0
Net loss	(59,786)	0	0	0	(59,786)
Ending Balance, Amount at Jan. 31, 2021	$ 474,976	$ 16	347,458	1,219	126,283
Ending Balance, Shares at Jan. 31, 2021	35,547,440	35,547,440
Exercise of stock options, Amount	$ 7,603	$ 0	7,603	0	0
Exercise of stock options, Shares	269,287	269,287
Vesting of restricted stock units, Amount	$ 4,592	$ 1	4,591	0	0
Vesting of restricted stock units, Shares		1,367,309
Employee stock purchase plan, Amount	7,208	$ 0	7,208	0	0
Employee stock purchase plan, Shares		118,782
Fair value of partially vested equity awards assumed in connection with acquisition	407	$ 0	407	0	0
Stock-based compensation expense related to stock awards granted to employees and consultants	80,020	0	80,020	0	0
Other comprehensive income (loss) - net of tax	(1,219)	0	0	(1,219)	0
Net loss	(26,411)	0	0	$ 0	(26,411)
Ending Balance, Amount at Jan. 31, 2022	$ 547,176	$ 17	$ 447,287		$ 99,872
Ending Balance, Shares at Jan. 31, 2022	37,302,818	37,302,818