Income Taxes - Tax Provision at Statutory Rate Reconciliation (Details) - USD ($)			12 Months Ended
	Jan. 01, 2018	Dec. 22, 2017	Jan. 31, 2019	Jan. 31, 2018
Income Tax Contingency [Line Items]
Statutory income tax rate	21.00%	34.00%	21.00%	32.90%
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal tax benefit at statutory rate of 32.9 percent			$ (1,232,000)	$ 1,047,000
State and local taxes, net of federal benefit (expense)			(95,000)	195,000
Change in valuation allowance			(767,000)	4,505,000
Incentive stock options			18,000	(112,000)
Change in fair value of warrants liability				15,000
Other			1,000	(24,000)
Reserve for uncertain tax position			32,000	(19,000)
Tax Cuts and Jobs Act				(5,827,000)
Expiring carryforwards			1,965,000
Other			102,000	214,000
Income tax benefit				84,000
Federal
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
R&D Credit			(158,000)	219,000
State
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
R&D Credit			$ 134,000	$ (129,000)