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Consolidated Statements of Comprehensive Loss (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consulting services, related party	$ 75	$ 300	$ 300

X

- Definition

The expense related to consulting services provided by related parties.

+ References

No definition available.

+ Details

Name:	bysi_ConsultingServicesRelatedParty
Namespace Prefix:	bysi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration