Balance Sheet Components - Schedule of Other Long-Term Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Assets Noncurrent [Abstract]
Deferred commissions, noncurrent	$ 8,330	$ 7,491
Deposits, noncurrent	2,934	1,564
Other assets, noncurrent	2,469	1,725
Other long-term assets	$ 13,733	$ 10,780