Organization and nature of operations (Details)	12 Months Ended
Dec. 31, 2018 item
Organization and nature of operations
Number of approved product	3

The number of approved products of the reporting entity.

No definition available.

Name:	neos_NumberOfApprovedProducts
Namespace Prefix:	neos_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration