Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Income Tax Contingency [Line Items]
Valuation allowance	$ 11,812,860	$ 16,318,124
Change in valuation allowance	4,504,875	(2,134,096)
Reserves for uncertain tax positions and corresponding interest and penalties	286,000	263,000
Accrued interest and penalties	0	$ 0
Tax expense	5,800,000
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Operating loss carryforwards	45,973,000
Change in valuation allowance	(4,505,000)
State
Income Tax Contingency [Line Items]
Operating loss carryforwards, subject to expire next twenty fiscal years	$ 18,230,000