XML 29 R5.htm IDEA: XBRL DOCUMENT
v3.7.0.1

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