Debt and Finance Lease Liabilities - First Amended and Restated Loan and Security Agreement (Details) - USD ($)		3 Months Ended		6 Months Ended
	Feb. 28, 2019	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jan. 31, 2020
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 0	$ 1,073,000
Common Stock
Debt Instrument [Line Items]
Exercise price (in dollars per share)		$ 8.02		$ 8.02		$ 8.02
Warrants outstanding (in shares)		75,137		75,137		75,137
Loans Payable
Debt Instrument [Line Items]
Loss on extinguishment of debt					1,073,000
Write off of deferred debt issuance cost					773,000
Debt prepayment cost					300,000
Debt extinguishment and modification fee					$ 112,000
Term loan
Debt Instrument [Line Items]
Debt instrument, face amount	$ 20,000,000
Debt instrument, term	36 months
Amended And Restated Loan And Security Agreement
Debt Instrument [Line Items]
Debt instrument, fee percentage	2.75%
Final payment accrual charged to interest expense		$ 257,000
Number of securities called by warrants (in shares)	150,274
Exercise price (in dollars per share)	$ 8.02
Amended And Restated Loan And Security Agreement | Before EBITDA Benchmark | Prime Rate
Debt Instrument [Line Items]
Variable interest rate	1.50%
Amended And Restated Loan And Security Agreement | After EBITDA Benchmark | Prime Rate
Debt Instrument [Line Items]
Variable interest rate	0.75%
Amended And Restated Loan And Security Agreement | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000,000
Debt instrument, fee percentage	0.15%
Line of credit, facility annual fee for first three years	$ 100,000
Line of credit, facility annual fee for fourth and fifth years	$ 75,000
Payment of debt fees		$ 100,000	$ 100,000
Line of credit facility termination fee percentage	1.50%