Fair Value Measurement - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Fair Value Disclosures [Abstract]
Estimated probability for contingent consideration payout	100.00%
Effect of discount rate on contingent consideration	$ 0.1

This element represents the amount of any change, including any differences arising upon settlement, recognized during the reporting period in the value of an asset or assets, arising from an item of contingent consideration, recognized in a business combination.

No definition available.

Name:	inwk_IncreaseOrDecreaseInContingentConsideration
Namespace Prefix:	inwk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration