Income Taxes - Schedule of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
Income tax benefit at statutory rate	$ (32,145)	$ (29,228)	$ (24,834)
State taxes, net of federal benefit	564	101	141
Impact of foreign income taxes	5,555	7,053	6,767
Stock based compensation	1,741	1,796	827
Non-deductible expenses	615	531	368
Change in valuation allowance	(7,605)	19,390	17,197
Research and development credits	(1,146)	(775)	(894)
Prior year true ups	(144)	918	(103)
Change in tax rate due to the Tax Act	33,110	0	0
Other	742	933	973
Provision for income taxes	$ 1,287	$ 719	$ 442