Revenue (Details)	6 Months Ended
Jun. 30, 2022
Change in Contract with Customer, Liability [Abstract]
Period for sales return	6 months

Represents the period for sales return under return policy.

No definition available.

Name:	sien_RevenueRecognitionSalesReturnsPeriod
Namespace Prefix:	sien_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration