Fair Value Measurement - Additional Information (Details)	9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair value measurement probability percentage	100.00%

Represents the percentage of probability of reaching the performance measures.

No definition available.

Name:	inwk_FairValueMeasurementsValuationProcessProbabilityPercentage
Namespace Prefix:	inwk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration