Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Outstanding Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Beginning Balance, Amount at Jan. 31, 2020	$ 448,072	$ 15	$ 261,220	$ 768	$ 186,069
Beginning Balance, Shares at Jan. 31, 2020		33,805,609
Issuance of shares through employee equity incentive plan, Amount	6,463	$ 0	6,463	0	0
Issuance of shares through employee equity incentive plan, Shares		478,643
Issuance of shares through employee stock purchase plan, Amount	2,660	$ 0	2,660	0	0
Issuance of shares through employee stock purchase plan, Shares		83,564
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	15,214	$ 0	15,214	0	0
Other comprehensive income (loss) - net of tax	(363)	0	0	(363)	0
Net income (loss)	(15,463)	0	0	0	(15,463)
Ending Balance, Amount at Apr. 30, 2020	455,583	$ 15	284,557	405	170,606
Ending Balance, Shares at Apr. 30, 2020		34,342,097
Beginning Balance, Amount at Jan. 31, 2020	448,072	$ 15	261,220	768	186,069
Beginning Balance, Shares at Jan. 31, 2020		33,805,609
Other comprehensive income (loss) - net of tax	595
Net income (loss)	(47,297)
Ending Balance, Amount at Oct. 31, 2020	462,653	$ 16	322,502	1,363	138,772
Ending Balance, Shares at Oct. 31, 2020		35,072,089
Beginning Balance, Amount at Apr. 30, 2020	455,583	$ 15	284,557	405	170,606
Beginning Balance, Shares at Apr. 30, 2020		34,342,097
Issuance of shares through employee equity incentive plan, Amount	344	$ 0	344	0	0
Issuance of shares through employee equity incentive plan, Shares		268,739
Stock-based compensation expense related to stock awards granted to employees and consultants	16,294	$ 0	16,294	0	0
Other comprehensive income (loss) - net of tax	1,182	0	0	1,182	0
Net income (loss)	(14,756)	0	0	0	(14,756)
Ending Balance, Amount at Jul. 31, 2020	458,647	$ 15	301,195	1,587	155,850
Ending Balance, Shares at Jul. 31, 2020		34,610,836
Issuance of shares through employee equity incentive plan, Amount	1,103	$ 1	1,102	0	0
Issuance of shares through employee equity incentive plan, Shares		361,886
Issuance of shares through employee stock purchase plan, Amount	3,164	$ 0	3,164	0	0
Issuance of shares through employee stock purchase plan, Shares		99,367
Stock-based compensation expense related to stock awards granted to employees and consultants	17,041	$ 0	17,041	0	0
Other comprehensive income (loss) - net of tax	(224)	0	0	(224)	0
Net income (loss)	(17,078)	0	0	0	(17,078)
Ending Balance, Amount at Oct. 31, 2020	462,653	$ 16	322,502	1,363	138,772
Ending Balance, Shares at Oct. 31, 2020		35,072,089
Beginning Balance, Amount at Jan. 31, 2021	$ 474,976	$ 16	347,458	1,219	126,283
Beginning Balance, Shares at Jan. 31, 2021	35,547,440	35,547,440
Issuance of shares through employee equity incentive plan, Amount	$ 6,741	$ 0	6,741	0	0
Issuance of shares through employee equity incentive plan, Shares		643,120
Issuance of shares through employee stock purchase plan, Amount	3,694	$ 0	3,694	0	0
Issuance of shares through employee stock purchase plan, Shares		82,783
Stock-based compensation expense related to stock awards granted to employees and consultants	17,128	$ 0	17,128	0	0
Other comprehensive income (loss) - net of tax	(427)	0	0	(427)	0
Net income (loss)	(10,818)	0	0	0	(10,818)
Ending Balance, Amount at Apr. 30, 2021	491,294	$ 16	375,021	792	115,465
Ending Balance, Shares at Apr. 30, 2021		36,273,343
Beginning Balance, Amount at Jan. 31, 2021	$ 474,976	$ 16	347,458	1,219	126,283
Beginning Balance, Shares at Jan. 31, 2021	35,547,440	35,547,440
Other comprehensive income (loss) - net of tax	$ (1,219)
Net income (loss)	(17,218)
Ending Balance, Amount at Oct. 31, 2021	$ 529,235	$ 17	420,153		109,065
Ending Balance, Shares at Oct. 31, 2021	36,925,142	36,925,142
Beginning Balance, Amount at Apr. 30, 2021	$ 491,294	$ 16	375,021	792	115,465
Beginning Balance, Shares at Apr. 30, 2021		36,273,343
Issuance of shares through employee equity incentive plan, Amount	1,461	$ 0	1,461	0	0
Issuance of shares through employee equity incentive plan, Shares		371,293
Stock-based compensation expense related to stock awards granted to employees and consultants	17,639	$ 0	17,639	0	0
Other comprehensive income (loss) - net of tax	(184)	0	0	(184)	0
Net income (loss)	(7,156)	0	0	0	(7,156)
Ending Balance, Amount at Jul. 31, 2021	503,054	$ 16	394,121	608	108,309
Ending Balance, Shares at Jul. 31, 2021		36,644,636
Issuance of shares through employee equity incentive plan, Amount	2,201	$ 1	2,200	0	0
Issuance of shares through employee equity incentive plan, Shares		244,507
Issuance of shares through employee stock purchase plan, Amount	3,513	$ 0	3,513	0	0
Issuance of shares through employee stock purchase plan, Shares		35,999
Stock-based compensation expense related to stock awards granted to employees and consultants	20,319	$ 0	20,319	0	0
Other comprehensive income (loss) - net of tax	(608)	0	0	(608)	0
Net income (loss)	756	0	0	$ 0	756
Ending Balance, Amount at Oct. 31, 2021	$ 529,235	$ 17	$ 420,153		$ 109,065
Ending Balance, Shares at Oct. 31, 2021	36,925,142	36,925,142