Accounts Payable, Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Payables and Accruals [Abstract]
Accounts payable	$ 5,198	$ 5,303
Accrued employee compensation	4,401	10,607
Accrued offering costs	2,294	2,349
Accrued PowerListing Network application provider fees	1,669	1,602
Accrued professional fees	1,275	809
Accrued sales tax	979	1,213
Preferred stock warrant liability	0	944
Other	3,948	2,806
Total	$ 19,764	$ 25,633