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INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Assets:
Net operating loss carryforwards	$ 14,192	$ 22,683
Stock awards	2,549	2,367
Research and development credit carryforwards	102	134
Purchased intangibles	234	415
Lease liabilities	775	528
Accrued expenses and other	1,422	991
Total Assets	19,274	27,118
Liabilities:
Purchased intangibles	(3,513)	(3,317)
Construction contracts	(968)	(1,618)
Property and equipment	(1,801)	(1,983)
Right-of-use assets	(770)	(525)
Other	(176)	(193)
Total Liabilities	(7,228)	(7,636)
Valuation allowances	(11,797)	(11,588)
Deferred tax assets	249	7,894
Net operating losses	6,300
Income tax (expense) benefits (Note 13)	$ (1,074)	$ 7,053	$ 4,651

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