Accrued Contract Cancellation Settlement (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accrued Contract Cancellation Settlement Disclosure [Abstract]
Accrued Contract Cancellation Settlement Liabilities	$ 0	$ 1,000

Represents the carrying value as of the balance sheet date of obligations incurred and payable, pertaining to contract cancellation.

No definition available.

Name:	snes_AccruedContractCancellationSettlementLiabilities
Namespace Prefix:	snes_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant