Commitments and Contingencies - Additional Information (Details) $ in Millions	Jan. 31, 2017 USD ($)
Sales Tax Accrual [Member]
Loss Contingencies [Line Items]
Accrued contingency	$ 0.7
401K Accrual [Member]
Loss Contingencies [Line Items]
Accrued contingency	$ 0.5

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualCarryingValueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant