Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Revenue:
Total revenue	$ 4,995	$ 18,812	$ 11,910	$ 27,297
Cost of revenue:
Total cost of revenue	3,181	7,924	7,587	13,501
Gross profit	1,814	10,888	4,323	13,796
Operating expenses:
Research and development	3,360	3,775	7,526	8,027
Selling and marketing	1,728	2,963	3,854	5,815
General and administrative	2,367	4,150	4,421	8,399
Severance and restructuring costs	543	659	1,029	870
Total operating expenses	7,998	11,547	16,830	23,111
Loss from operations	(6,184)	(659)	(12,507)	(9,315)
Other income (expense), net	373	(78)	165	(1,869)
Loss before income taxes	(5,811)	(737)	(12,342)	(11,184)
Income tax benefit	45	563	66	161
Net loss	$ (5,766)	$ (174)	$ (12,276)	$ (11,023)
Net loss per share, basic	$ (0.15)		$ (0.33)	$ (0.30)
Net loss per share, diluted	$ (0.15)		$ (0.33)	$ (0.30)
Weighted average common shares outstanding, basic	37,527	36,602	37,376	36,532
Weighted average common shares outstanding, diluted	37,527	36,602	37,376	36,532
Comprehensive loss:
Net loss	$ (5,766)	$ (174)	$ (12,276)	$ (11,023)
Other comprehensive income, net of tax:
Foreign currency translation adjustment	1,665	133	1,641	1,340
Unrealized (losses) gains on marketable securities	(13)	25	(4)	60
Total other comprehensive income	1,652	158	1,637	1,400
Comprehensive loss	(4,114)	(16)	(10,639)	(9,623)
Product [Member]
Revenue:
Total revenue	1,066	11,968	4,164	13,147
Cost of revenue:
Cost of revenue	788	3,039	2,368	3,948
Service [Member]
Revenue:
Total revenue	3,929	6,844	7,746	14,150
Cost of revenue:
Cost of revenue	$ 2,393	$ 4,885	$ 5,219	$ 9,553